diff --git a/src/ui_ng/src/app/account/account-settings/account-settings-modal.component.ts b/src/ui_ng/src/app/account/account-settings/account-settings-modal.component.ts
index 960a8a3ef..fac1bd8b1 100644
--- a/src/ui_ng/src/app/account/account-settings/account-settings-modal.component.ts
+++ b/src/ui_ng/src/app/account/account-settings/account-settings-modal.component.ts
@@ -3,10 +3,8 @@ import { NgForm } from '@angular/forms';
 
 import { SessionUser } from '../../shared/session-user';
 import { SessionService } from '../../shared/session.service';
-import { MessageService } from '../../global-message/message.service';
-import { AlertType, httpStatusCode } from '../../shared/shared.const';
-import { errorHandler, accessErrorHandler } from '../../shared/shared.utils';
 import { InlineAlertComponent } from '../../shared/inline-alert/inline-alert.component';
+import { MessageHandlerService } from '../../shared/message-handler/message-handler.service';
 
 @Component({
     selector: "account-settings-modal",
@@ -38,7 +36,7 @@ export class AccountSettingsModalComponent implements OnInit, AfterViewChecked {
 
     constructor(
         private session: SessionService,
-        private msgService: MessageService) { }
+        private msgHandler: MessageHandlerService) { }
 
     ngOnInit(): void {
         //Value copy
@@ -112,10 +110,10 @@ export class AccountSettingsModalComponent implements OnInit, AfterViewChecked {
     }
 
     public get isValid(): boolean {
-        return this.accountForm && 
-        this.accountForm.valid && 
-        this.error === null &&
-        this.validationStateMap["account_settings_email"]; //backend check is valid as well
+        return this.accountForm &&
+            this.accountForm.valid &&
+            this.error === null &&
+            this.validationStateMap["account_settings_email"]; //backend check is valid as well
     }
 
     public get showProgress(): boolean {
@@ -182,14 +180,15 @@ export class AccountSettingsModalComponent implements OnInit, AfterViewChecked {
             .then(() => {
                 this.isOnCalling = false;
                 this.opened = false;
-                this.msgService.announceMessage(200, "PROFILE.SAVE_SUCCESS", AlertType.SUCCESS);
+                this.msgHandler.showSuccess("PROFILE.SAVE_SUCCESS");
             })
             .catch(error => {
                 this.isOnCalling = false;
                 this.error = error;
-                if (accessErrorHandler(error, this.msgService)) {
+                if (this.msgHandler.isAppLevel(error)) {
                     this.opened = false;
-                } else {
+                    this.msgHandler.handleError(error);
+                }else{
                     this.inlineAlert.showInlineError(error);
                 }
             });
diff --git a/src/ui_ng/src/app/account/password/password-setting.component.ts b/src/ui_ng/src/app/account/password/password-setting.component.ts
index 276f408be..6b38a8e8c 100644
--- a/src/ui_ng/src/app/account/password/password-setting.component.ts
+++ b/src/ui_ng/src/app/account/password/password-setting.component.ts
@@ -4,10 +4,9 @@ import { NgForm } from '@angular/forms';
 
 import { PasswordSettingService } from './password-setting.service';
 import { SessionService } from '../../shared/session.service';
-import { AlertType, httpStatusCode } from '../../shared/shared.const';
-import { MessageService } from '../../global-message/message.service';
-import { errorHandler, isEmptyForm, accessErrorHandler } from '../../shared/shared.utils';
+import { isEmptyForm } from '../../shared/shared.utils';
 import { InlineAlertComponent } from '../../shared/inline-alert/inline-alert.component';
+import { MessageHandlerService } from '../../shared/message-handler/message-handler.service';
 
 @Component({
     selector: 'password-setting',
@@ -36,7 +35,7 @@ export class PasswordSettingComponent implements AfterViewChecked {
     constructor(
         private passwordService: PasswordSettingService,
         private session: SessionService,
-        private msgService: MessageService) { }
+        private msgHandler: MessageHandlerService) { }
 
     //If form is valid
     public get isValid(): boolean {
@@ -66,10 +65,10 @@ export class PasswordSettingComponent implements AfterViewChecked {
             let cont = this.pwdForm.controls[key];
             if (cont) {
                 this.validationStateMap[key] = cont.valid;
-                if(key === "reNewPassword" && cont.valid){
+                if (key === "reNewPassword" && cont.valid) {
                     let compareCont = this.pwdForm.controls["newPassword"];
-                    if(compareCont){
-                        this.validationStateMap[key]= cont.value === compareCont.value;
+                    if (compareCont) {
+                        this.validationStateMap[key] = cont.value === compareCont.value;
                     }
                 }
             }
@@ -145,16 +144,23 @@ export class PasswordSettingComponent implements AfterViewChecked {
             })
             .then(() => {
                 this.onCalling = false;
-                this.opened = false;
-                this.msgService.announceMessage(200, "CHANGE_PWD.SAVE_SUCCESS", AlertType.SUCCESS);
+                this.opened = false
+                this.msgHandler.showSuccess("CHANGE_PWD.SAVE_SUCCESS");
             })
             .catch(error => {
                 this.onCalling = false;
                 this.error = error;
-                if(accessErrorHandler(error, this.msgService)){
+                if (this.msgHandler.isAppLevel(error)) {
                     this.opened = false;
-                }else{
-                    this.inlineAlert.showInlineError(error);
+                    this.msgHandler.handleError(error);
+                } else {
+                    //Special case for 400
+                    let msg = '' + error._body;
+                    if (msg && msg.includes('old_password_is_not_correct')) {
+                        this.inlineAlert.showInlineError("INCONRRECT_OLD_PWD");
+                    } else {
+                        this.inlineAlert.showInlineError(error);
+                    }
                 }
             });
     }
diff --git a/src/ui_ng/src/app/account/password/reset-password.component.ts b/src/ui_ng/src/app/account/password/reset-password.component.ts
index 89afbe474..0bb9801d8 100644
--- a/src/ui_ng/src/app/account/password/reset-password.component.ts
+++ b/src/ui_ng/src/app/account/password/reset-password.component.ts
@@ -4,16 +4,14 @@ import { NgForm } from '@angular/forms';
 
 import { PasswordSettingService } from './password-setting.service';
 import { InlineAlertComponent } from '../../shared/inline-alert/inline-alert.component';
-import { errorHandler, accessErrorHandler } from '../../shared/shared.utils';
-import { AlertType } from '../../shared/shared.const';
-import { MessageService } from '../../global-message/message.service';
+import { MessageHandlerService } from '../../shared/message-handler/message-handler.service';
 
 @Component({
     selector: 'reset-password',
     templateUrl: "reset-password.component.html",
     styleUrls: ['password.component.css', '../../common.css']
 })
-export class ResetPasswordComponent implements OnInit{
+export class ResetPasswordComponent implements OnInit {
     opened: boolean = true;
     private onGoing: boolean = false;
     private password: string = "";
@@ -28,7 +26,7 @@ export class ResetPasswordComponent implements OnInit{
     constructor(
         private pwdService: PasswordSettingService,
         private route: ActivatedRoute,
-        private msgService: MessageService,
+        private msgHandler: MessageHandlerService,
         private router: Router) { }
 
     ngOnInit(): void {
@@ -44,9 +42,9 @@ export class ResetPasswordComponent implements OnInit{
     }
 
     public getValidationState(key: string): boolean {
-        return this.validationState && 
-        this.validationState[key] &&
-        key === 'reNewPassword'?this.samePassword():true;
+        return this.validationState &&
+            this.validationState[key] &&
+            key === 'reNewPassword' ? this.samePassword() : true;
     }
 
     public open(): void {
@@ -61,7 +59,7 @@ export class ResetPasswordComponent implements OnInit{
 
     public send(): void {
         //If already reset password ok, navigator to sign-in
-        if(this.resetOk){
+        if (this.resetOk) {
             this.router.navigate(['sign-in']);
             return;
         }
@@ -77,24 +75,24 @@ export class ResetPasswordComponent implements OnInit{
 
         this.onGoing = true;
         this.pwdService.resetPassword(this.resetUuid, this.password)
-        .then(() => {
-            this.onGoing = false;
-            this.resetOk = true;
-            this.inlineAlert.showInlineSuccess({message:'RESET_PWD.RESET_OK'});
-        })
-        .catch(error => {
-            this.onGoing = false;
-            if(accessErrorHandler(error, this.msgService)){
-                this.close();
-            }else{
-                this.inlineAlert.showInlineError(errorHandler(error));
-            }
-        });
+            .then(() => {
+                this.onGoing = false;
+                this.resetOk = true;
+                this.inlineAlert.showInlineSuccess({ message: 'RESET_PWD.RESET_OK' });
+            })
+            .catch(error => {
+                this.onGoing = false;
+                if (this.msgHandler.isAppLevel(error)) {
+                    this.close();
+                } else {
+                    this.inlineAlert.showInlineError(error);
+                }
+            });
     }
 
     public handleValidation(key: string, flag: boolean): void {
         if (flag) {
-            if(!this.validationState[key]){
+            if (!this.validationState[key]) {
                 this.validationState[key] = true;
             }
         } else {
diff --git a/src/ui_ng/src/app/account/sign-up/sign-up.component.ts b/src/ui_ng/src/app/account/sign-up/sign-up.component.ts
index f94c5b75f..c5ae6381f 100644
--- a/src/ui_ng/src/app/account/sign-up/sign-up.component.ts
+++ b/src/ui_ng/src/app/account/sign-up/sign-up.component.ts
@@ -6,7 +6,6 @@ import { User } from '../../user/user';
 
 import { SessionService } from '../../shared/session.service';
 import { UserService } from '../../user/user.service';
-import { errorHandler } from '../../shared/shared.utils';
 import { InlineAlertComponent } from '../../shared/inline-alert/inline-alert.component';
 
 import { Modal } from 'clarity-angular';
diff --git a/src/ui_ng/src/app/base/global-search/search-result.component.ts b/src/ui_ng/src/app/base/global-search/search-result.component.ts
index 1516a57d3..82fc97f95 100644
--- a/src/ui_ng/src/app/base/global-search/search-result.component.ts
+++ b/src/ui_ng/src/app/base/global-search/search-result.component.ts
@@ -2,14 +2,12 @@ import { Component, Output, EventEmitter, OnInit, OnDestroy } from '@angular/cor
 
 import { GlobalSearchService } from './global-search.service';
 import { SearchResults } from './search-results';
-import { errorHandler, accessErrorHandler } from '../../shared/shared.utils';
-import { AlertType, ListMode } from '../../shared/shared.const';
-import { MessageService } from '../../global-message/message.service';
-
 import { SearchTriggerService } from './search-trigger.service';
 
 import { Subscription } from 'rxjs/Subscription';
 
+import { MessageHandlerService } from '../../shared/message-handler/message-handler.service';
+
 @Component({
     selector: "search-result",
     templateUrl: "search-result.component.html",
@@ -38,7 +36,7 @@ export class SearchResultComponent implements OnInit, OnDestroy {
 
     constructor(
         private search: GlobalSearchService,
-        private msgService: MessageService,
+        private msgHandler: MessageHandlerService,
         private searchTrigger: SearchTriggerService) { }
 
     ngOnInit() {
@@ -73,10 +71,6 @@ export class SearchResultComponent implements OnInit, OnDestroy {
         return res//Empty object
     }
 
-    public get listMode(): string {
-        return ListMode.READONLY;
-    }
-
     public get state(): boolean {
         return this.stateIndicator;
     }
@@ -134,9 +128,7 @@ export class SearchResultComponent implements OnInit, OnDestroy {
             })
             .catch(error => {
                 this.onGoing = false;
-                if (!accessErrorHandler(error, this.msgService)) {
-                    this.msgService.announceMessage(error.status, errorHandler(error), AlertType.DANGER);
-                }
+                this.msgHandler.handleError(error);
             });
     }
 }
\ No newline at end of file
diff --git a/src/ui_ng/src/app/base/navigator/navigator.component.ts b/src/ui_ng/src/app/base/navigator/navigator.component.ts
index 0cb80ba89..686a80902 100644
--- a/src/ui_ng/src/app/base/navigator/navigator.component.ts
+++ b/src/ui_ng/src/app/base/navigator/navigator.component.ts
@@ -9,11 +9,10 @@ import { SessionUser } from '../../shared/session-user';
 import { SessionService } from '../../shared/session.service';
 import { CookieService } from 'angular2-cookie/core';
 
-import { supportedLangs, enLang, languageNames, CommonRoutes, AlertType } from '../../shared/shared.const';
-import { errorHandler } from '../../shared/shared.utils';
+import { supportedLangs, enLang, languageNames, CommonRoutes } from '../../shared/shared.const';
 import { AppConfigService } from '../../app-config.service';
 import { SearchTriggerService } from '../global-search/search-trigger.service';
-import { MessageService } from '../../global-message/message.service';
+import { MessageHandlerService } from '../../shared/message-handler/message-handler.service';
 
 @Component({
     selector: 'navigator',
@@ -35,7 +34,7 @@ export class NavigatorComponent implements OnInit {
         private translate: TranslateService,
         private cookie: CookieService,
         private appConfigService: AppConfigService,
-        private msgService: MessageService,
+        private msgHandler: MessageHandlerService,
         private searchTrigger: SearchTriggerService) { }
 
     ngOnInit(): void {
@@ -71,10 +70,10 @@ export class NavigatorComponent implements OnInit {
     }
 
     public get canDownloadCert(): boolean {
-        return this.session.getCurrentUser() && 
-        this.session.getCurrentUser().has_admin_role>0 &&
-        this.appConfigService.getConfig() &&
-        this.appConfigService.getConfig().has_ca_root;
+        return this.session.getCurrentUser() &&
+            this.session.getCurrentUser().has_admin_role > 0 &&
+            this.appConfigService.getConfig() &&
+            this.appConfigService.getConfig().has_ca_root;
     }
 
     matchLang(lang: string): boolean {
@@ -113,7 +112,7 @@ export class NavigatorComponent implements OnInit {
                 this.router.navigate([CommonRoutes.EMBEDDED_SIGN_IN]);
             })
             .catch(error => {
-                this.msgService.announceMessage(error.status | 500, errorHandler(error), AlertType.WARNING);
+                this.msgHandler.handleError(error);
             });
         //Confirm search result panel is close
         this.searchTrigger.closeSearch(true);
diff --git a/src/ui_ng/src/app/config/config.component.ts b/src/ui_ng/src/app/config/config.component.ts
index 756dff27d..4bd896891 100644
--- a/src/ui_ng/src/app/config/config.component.ts
+++ b/src/ui_ng/src/app/config/config.component.ts
@@ -4,9 +4,7 @@ import { NgForm } from '@angular/forms';
 
 import { ConfigurationService } from './config.service';
 import { Configuration } from './config';
-import { MessageService } from '../global-message/message.service';
-import { AlertType, ConfirmationTargets, ConfirmationState } from '../shared/shared.const';
-import { errorHandler, accessErrorHandler } from '../shared/shared.utils';
+import { ConfirmationTargets, ConfirmationState } from '../shared/shared.const';;
 import { StringValueItem } from './config';
 import { ConfirmationDialogService } from '../shared/confirmation-dialog/confirmation-dialog.service';
 import { Subscription } from 'rxjs/Subscription';
@@ -17,6 +15,7 @@ import { ConfigurationEmailComponent } from './email/config-email.component';
 
 import { AppConfigService } from '../app-config.service';
 import { SessionService } from '../shared/session.service';
+import { MessageHandlerService } from '../shared/message-handler/message-handler.service';
 
 const fakePass = "fakepassword";
 const TabLinkContentMap = {
@@ -45,7 +44,7 @@ export class ConfigurationComponent implements OnInit, OnDestroy {
     @ViewChild(ConfigurationAuthComponent) authConfig: ConfigurationAuthComponent;
 
     constructor(
-        private msgService: MessageService,
+        private msgHandler: MessageHandlerService,
         private configService: ConfigurationService,
         private confirmService: ConfirmationDialogService,
         private appConfigService: AppConfigService,
@@ -204,13 +203,11 @@ export class ConfigurationComponent implements OnInit, OnDestroy {
                     //Reload bootstrap option
                     this.appConfigService.load().catch(error => console.error("Failed to reload bootstrap option with error: ", error));
 
-                    this.msgService.announceMessage(response.status, "CONFIG.SAVE_SUCCESS", AlertType.SUCCESS);
+                    this.msgHandler.showSuccess("CONFIG.SAVE_SUCCESS");
                 })
                 .catch(error => {
                     this.onGoing = false;
-                    if (!accessErrorHandler(error, this.msgService)) {
-                        this.msgService.announceMessage(error.status, errorHandler(error), AlertType.DANGER);
-                    }
+                    this.msgHandler.handleError(error);
                 });
         } else {
             //Inprop situation, should not come here
@@ -262,11 +259,15 @@ export class ConfigurationComponent implements OnInit, OnDestroy {
         this.configService.testMailServer(mailSettings)
             .then(response => {
                 this.testingOnGoing = false;
-                this.msgService.announceMessage(200, "CONFIG.TEST_MAIL_SUCCESS", AlertType.SUCCESS);
+                this.msgHandler.showSuccess("CONFIG.TEST_MAIL_SUCCESS");
             })
             .catch(error => {
                 this.testingOnGoing = false;
-                this.msgService.announceMessage(error.status, errorHandler(error), AlertType.WARNING);
+                let err = error._body;
+                if(!err){
+                    err = "UNKNOWN";
+                }
+                this.msgHandler.showError("CONFIG.TEST_MAIL_FAILED", {'param': err});
             });
     }
 
@@ -279,7 +280,7 @@ export class ConfigurationComponent implements OnInit, OnDestroy {
         }
 
         let allChanges = this.getChanges();
-        for(let prop in allChanges){
+        for (let prop in allChanges) {
             if (prop.startsWith("ldap_")) {
                 ldapSettings[prop] = allChanges[prop];
             }
@@ -291,11 +292,15 @@ export class ConfigurationComponent implements OnInit, OnDestroy {
         this.configService.testLDAPServer(ldapSettings)
             .then(respone => {
                 this.testingOnGoing = false;
-                this.msgService.announceMessage(200, "CONFIG.TEST_LDAP_SUCCESS", AlertType.SUCCESS);
+                this.msgHandler.showSuccess("CONFIG.TEST_LDAP_SUCCESS");
             })
             .catch(error => {
                 this.testingOnGoing = false;
-                this.msgService.announceMessage(error.status, errorHandler(error), AlertType.WARNING);
+                let err = error._body;
+                if(!err){
+                    err = "UNKNOWN";
+                }
+                this.msgHandler.showError("CONFIG.TEST_LDAP_FAILED", err);
             });
     }
 
@@ -342,9 +347,7 @@ export class ConfigurationComponent implements OnInit, OnDestroy {
             })
             .catch(error => {
                 this.onGoing = false;
-                if (!accessErrorHandler(error, this.msgService)) {
-                    this.msgService.announceMessage(error.status, errorHandler(error), AlertType.DANGER);
-                }
+                this.msgHandler.handleError(error);
             });
     }
 
diff --git a/src/ui_ng/src/app/shared/inline-alert/inline-alert.component.ts b/src/ui_ng/src/app/shared/inline-alert/inline-alert.component.ts
index e5c4c14ee..9079846b0 100644
--- a/src/ui_ng/src/app/shared/inline-alert/inline-alert.component.ts
+++ b/src/ui_ng/src/app/shared/inline-alert/inline-alert.component.ts
@@ -17,7 +17,7 @@ export class InlineAlertComponent {
 
     @Output() confirmEvt = new EventEmitter<boolean>();
 
-    constructor(private translate: TranslateService){}
+    constructor(private translate: TranslateService) { }
 
     public get errorMessage(): string {
         return this.displayedText;
@@ -26,6 +26,9 @@ export class InlineAlertComponent {
     //Show error message inline
     public showInlineError(error: any): void {
         this.displayedText = errorHandler(error);
+        if (this.displayedText) {
+            this.translate.get(this.displayedText).subscribe((res: string) => this.displayedText = res);
+        }
 
         this.inlineAlertType = 'alert-danger';
         this.showCancelAction = false;
@@ -37,7 +40,7 @@ export class InlineAlertComponent {
     //Show confirmation info with action button
     public showInlineConfirmation(warning: any): void {
         this.displayedText = "";
-        if(warning && warning.message){
+        if (warning && warning.message) {
             this.translate.get(warning.message).subscribe((res: string) => this.displayedText = res);
         }
         this.inlineAlertType = 'alert-warning';
@@ -50,7 +53,7 @@ export class InlineAlertComponent {
     //Show inline sccess info
     public showInlineSuccess(info: any): void {
         this.displayedText = "";
-        if(info && info.message){
+        if (info && info.message) {
             this.translate.get(info.message).subscribe((res: string) => this.displayedText = res);
         }
         this.inlineAlertType = 'alert-success';
diff --git a/src/ui_ng/src/app/shared/message-handler/message-handler.service.ts b/src/ui_ng/src/app/shared/message-handler/message-handler.service.ts
index 84865dc2c..5e1d4b26e 100644
--- a/src/ui_ng/src/app/shared/message-handler/message-handler.service.ts
+++ b/src/ui_ng/src/app/shared/message-handler/message-handler.service.ts
@@ -3,11 +3,17 @@ import { Subject } from 'rxjs/Subject';
 
 import { MessageService } from '../../global-message/message.service';
 import { AlertType, httpStatusCode } from '../../shared/shared.const';
+import { errorHandler } from '../../shared/shared.utils';
+import { TranslateService } from '@ngx-translate/core';
+import { SessionService } from '../../shared/session.service';
 
 @Injectable()
 export class MessageHandlerService {
 
-    constructor(private msgService: MessageService) { }
+    constructor(
+        private msgService: MessageService,
+        private translate: TranslateService,
+        private session: SessionService) { }
 
     //Handle the error and map it to the suitable message
     //base on the status code of error.
@@ -16,42 +22,31 @@ export class MessageHandlerService {
         if (!error) {
             return;
         }
-        console.log(JSON.stringify(error));
+        let msg = errorHandler(error);
 
         if (!(error.statusCode || error.status)) {
-            //treat as string message
-            let msg = '' + error;
             this.msgService.announceMessage(500, msg, AlertType.DANGER);
         } else {
-            let msg = 'UNKNOWN_ERROR';
-            switch (error.statusCode || error.status) {
-                case 400:
-                    msg = "BAD_REQUEST_ERROR";
-                    break;
-                case 401:
-                    msg = "UNAUTHORIZED_ERROR";
-                    this.msgService.announceAppLevelMessage(error.statusCode, msg, AlertType.DANGER);
-                    return;
-                case 403:
-                    msg = "FORBIDDEN_ERROR";
-                    break;
-                case 404:
-                    msg = "NOT_FOUND_ERROR";
-                    break;
-                case 412:
-                case 409:
-                    msg = "CONFLICT_ERROR";
-                    break;
-                case 500:
-                    msg = "SERVER_ERROR";
-                    break;
-                default:
-                    break;
+            let code = error.statusCode | error.status;
+            if (code === httpStatusCode.Unauthorized) {
+                this.msgService.announceAppLevelMessage(code, msg, AlertType.DANGER);
+                //Session is invalida now, clare session cache
+                this.session.clear();
+            } else {
+                this.msgService.announceMessage(code, msg, AlertType.DANGER);
             }
-            this.msgService.announceMessage(error.statusCode, msg, AlertType.DANGER);
         }
     }
 
+    public showError(message: string, params: any): void {
+        if (!params) {
+            params = {};
+        }
+        this.translate.get(message, params).subscribe((res: string) => {
+            this.msgService.announceMessage(500, res, AlertType.DANGER);
+        });
+    }
+
     public showSuccess(message: string): void {
         if (message && message.trim() != "") {
             this.msgService.announceMessage(200, message, AlertType.SUCCESS);
diff --git a/src/ui_ng/src/app/shared/session.service.ts b/src/ui_ng/src/app/shared/session.service.ts
index 213d262be..3d09652bf 100644
--- a/src/ui_ng/src/app/shared/session.service.ts
+++ b/src/ui_ng/src/app/shared/session.service.ts
@@ -46,6 +46,12 @@ export class SessionService {
         return Promise.reject(error.message || error);
     }
 
+    //Clear session
+    clear(): void {
+        this.currentUser = null;
+        this.projectMembers = [];
+    }
+
     //Submit signin form to backend (NOT restful service)
     signIn(signInCredential: SignInCredential): Promise<any> {
         //Build the form package
diff --git a/src/ui_ng/src/app/shared/shared.utils.ts b/src/ui_ng/src/app/shared/shared.utils.ts
index 71440279a..e1c6de72f 100644
--- a/src/ui_ng/src/app/shared/shared.utils.ts
+++ b/src/ui_ng/src/app/shared/shared.utils.ts
@@ -8,19 +8,33 @@ import { MessageService } from '../global-message/message.service';
  * @returns {string}
  */
 export const errorHandler = function (error: any): string {
-    if (error) {
-        if (error.message) {
-            return error.message;
-        } else if (error._body) {
-            return error._body;
-        } else if (error.statusText) {
-            return error.statusText;
-        } else {
-            return error;
+    if (!error) {
+        return "UNKNOWN_ERROR";
+    }
+    console.log(JSON.stringify(error));
+
+    if (!(error.statusCode || error.status)) {
+        //treat as string message
+        return '' + error;
+    } else {
+        switch (error.statusCode || error.status) {
+            case 400:
+                return "BAD_REQUEST_ERROR";
+            case 401:
+                return "UNAUTHORIZED_ERROR";
+            case 403:
+                return "FORBIDDEN_ERROR";
+            case 404:
+                return "NOT_FOUND_ERROR";
+            case 412:
+            case 409:
+                return "CONFLICT_ERROR";
+            case 500:
+                return "SERVER_ERROR";
+            default:
+                return "UNKNOWN_ERROR";
         }
     }
-
-    return "UNKNOWN_ERROR";
 }
 
 /**
@@ -52,9 +66,6 @@ export const accessErrorHandler = function (error: any, msgService: MessageServi
         if (error.status === httpStatusCode.Unauthorized) {
             msgService.announceAppLevelMessage(error.status, "UNAUTHORIZED_ERROR", AlertType.DANGER);
             return true;
-        } else if (error.status === httpStatusCode.Forbidden) {
-            msgService.announceAppLevelMessage(error.status, "FORBIDDEN_ERROR", AlertType.DANGER);
-            return true;
         }
     }
 
diff --git a/src/ui_ng/src/app/shared/statictics/statistics-panel.component.ts b/src/ui_ng/src/app/shared/statictics/statistics-panel.component.ts
index d3451d49d..0dd0f12b0 100644
--- a/src/ui_ng/src/app/shared/statictics/statistics-panel.component.ts
+++ b/src/ui_ng/src/app/shared/statictics/statistics-panel.component.ts
@@ -1,16 +1,13 @@
 import { Component, Input, OnInit } from '@angular/core';
 
 import { StatisticsService } from './statistics.service';
-import { errorHandler, accessErrorHandler } from '../../shared/shared.utils';
-import { AlertType } from '../../shared/shared.const';
-
-import { MessageService } from '../../global-message/message.service';
-
 import { Statistics } from './statistics';
 
 import { SessionService } from '../session.service';
 import { Volumes } from './volumes';
 
+import { MessageHandlerService } from '../message-handler/message-handler.service';
+
 @Component({
     selector: 'statistics-panel',
     templateUrl: "statistics-panel.component.html",
@@ -25,7 +22,7 @@ export class StatisticsPanelComponent implements OnInit {
 
     constructor(
         private statistics: StatisticsService,
-        private msgService: MessageService,
+        private msgHandler: MessageHandlerService,
         private session: SessionService) { }
 
     ngOnInit(): void {
@@ -47,9 +44,7 @@ export class StatisticsPanelComponent implements OnInit {
         this.statistics.getStatistics()
             .then(statistics => this.originalCopy = statistics)
             .catch(error => {
-                if (!accessErrorHandler(error, this.msgService)) {
-                    this.msgService.announceMessage(error.status, errorHandler(error), AlertType.WARNING);
-                }
+                this.msgHandler.handleError(error);
             });
     }
 
@@ -57,9 +52,7 @@ export class StatisticsPanelComponent implements OnInit {
         this.statistics.getVolumes()
             .then(volumes => this.volumesInfo = volumes)
             .catch(error => {
-                if (!accessErrorHandler(error, this.msgService)) {
-                    this.msgService.announceMessage(error.status, errorHandler(error), AlertType.WARNING);
-                }
+                this.msgHandler.handleError(error);
             });
     }
 
diff --git a/src/ui_ng/src/i18n/lang/en-lang.json b/src/ui_ng/src/i18n/lang/en-lang.json
index fb8842083..e7b9b0499 100644
--- a/src/ui_ng/src/i18n/lang/en-lang.json
+++ b/src/ui_ng/src/i18n/lang/en-lang.json
@@ -379,6 +379,8 @@
         },
         "TEST_MAIL_SUCCESS": "Connection to mail server is verified",
         "TEST_LDAP_SUCCESS": "Connection to LDAP server is verified",
+        "TEST_MAIL_FAILED": "Failed to verify mail server with error: {{param}}",
+        "TEST_LDAP_FAILED": "Failed to verify LDAP server with error: {{param}}",
         "LEAVING_CONFIRMATION_TITLE": "Confirm to leave",
         "LEAVING_CONFIRMATION_SUMMARY": "Changes have not been saved yet, do you really want to leave currnet page?"
     },
@@ -419,5 +421,7 @@
     "BAD_REQUEST_ERROR": "We are unable to perform your action because of a bad request",
     "NOT_FOUND_ERROR": "Your request can not be completed because the object does not exist",
     "CONFLICT_ERROR": "We are unable to perform your action because your submission has conflicts",
-    "SERVER_ERROR": "We are unable to perform your action because internal server errors have occurred"
+    "SERVER_ERROR": "We are unable to perform your action because internal server errors have occurred",
+    "INCONRRECT_OLD_PWD": "The old password is incorrect",
+    "UNKNOWN": "n/a"
 }
\ No newline at end of file
diff --git a/src/ui_ng/src/i18n/lang/zh-lang.json b/src/ui_ng/src/i18n/lang/zh-lang.json
index 56d0d24ca..66684633f 100644
--- a/src/ui_ng/src/i18n/lang/zh-lang.json
+++ b/src/ui_ng/src/i18n/lang/zh-lang.json
@@ -379,6 +379,8 @@
         },
         "TEST_MAIL_SUCCESS": "邮件服务器的连通正常",
         "TEST_LDAP_SUCCESS": "LDAP服务器的连通正常",
+        "TEST_MAIL_FAILED": "验证邮件服务器失败，错误: {{param}}",
+        "TEST_LDAP_FAILED": "验证LDAP服务器失败，错误: {{param}}",
         "LEAVING_CONFIRMATION_TITLE": "确定离开?",
         "LEAVING_CONFIRMATION_SUMMARY": "存在未保存的配置更改, 确认离开当前配置页?"
     },
@@ -419,5 +421,7 @@
     "BAD_REQUEST_ERROR": "错误请求导致无法完成操作",
     "NOT_FOUND_ERROR": "对象不存在故无法完成你的请求",
     "CONFLICT_ERROR": "你的提交包含冲突故操作无法完成",
-    "SERVER_ERROR": "服务器出现内部错误，请求无法完成"
+    "SERVER_ERROR": "服务器出现内部错误，请求无法完成",
+    "INCONRRECT_OLD_PWD": "旧密码不正确",
+    "UNKNOWN": "n/a"
 }
\ No newline at end of file