diff --git a/src/lang/en.json b/src/lang/en.json
index 4e165a8b6..a3989c56f 100644
--- a/src/lang/en.json
+++ b/src/lang/en.json
@@ -9,7 +9,7 @@
     "areyousure": "Are you sure?",
     "back": "Back",
     "cancel": "Cancel",
-    "cannotconnect": "Cannot connect: Verify that you have correctly typed the URL and that your site uses Moodle 2.4 or later.",
+    "cannotconnect": "Cannot connect: verify that you have typed correctly the URL.",
     "cannotdownloadfiles": "File downloading is disabled. Please contact your site administrator.",
     "captureaudio": "Record audio",
     "capturedimage": "Taken picture.",
diff --git a/src/providers/sites.ts b/src/providers/sites.ts
index 8ceaffac4..ee31c0127 100644
--- a/src/providers/sites.ts
+++ b/src/providers/sites.ts
@@ -21,6 +21,7 @@ import { CoreLoggerProvider } from './logger';
 import { CoreSitesFactoryProvider } from './sites-factory';
 import { CoreTextUtilsProvider } from './utils/text';
 import { CoreUrlUtilsProvider } from './utils/url';
+import { CoreUtilsProvider } from './utils/utils';
 import { CoreConstants } from '@core/constants';
 import { CoreConfigConstants } from '../configconstants';
 import { CoreSite } from '@classes/site';
@@ -211,7 +212,8 @@ export class CoreSitesProvider {
 
     constructor(logger: CoreLoggerProvider, private http: HttpClient, private sitesFactory: CoreSitesFactoryProvider,
             private appProvider: CoreAppProvider, private translate: TranslateService, private urlUtils: CoreUrlUtilsProvider,
-            private eventsProvider: CoreEventsProvider,  private textUtils: CoreTextUtilsProvider) {
+            private eventsProvider: CoreEventsProvider,  private textUtils: CoreTextUtilsProvider,
+            private utils: CoreUtilsProvider) {
         this.logger = logger.getInstance('CoreSitesProvider');
 
         this.appDB = appProvider.getDB();
@@ -258,14 +260,10 @@ export class CoreSitesProvider {
                 protocol = protocol == 'https://' ? 'http://' : 'https://';
 
                 return this.checkSiteWithProtocol(siteUrl, protocol).catch((secondError) => {
-                    // Site doesn't exist.
-                    if (secondError.error) {
-                        return Promise.reject(secondError.error);
-                    } else if (error.error) {
-                        return Promise.reject(error.error);
-                    }
-
-                    return Promise.reject(this.translate.instant('core.login.checksiteversion'));
+                    // Site doesn't exist. Return the error message.
+                    return Promise.reject(this.textUtils.getErrorMessageFromError(error) ||
+                            this.textUtils.getErrorMessageFromError(secondError) ||
+                            this.translate.instant('core.cannotconnect'));
                 });
             });
         }
@@ -286,7 +284,7 @@ export class CoreSitesProvider {
 
         return this.siteExists(siteUrl).catch((error) => {
             // Do not continue checking if WS are not enabled.
-            if (error.errorcode && error.errorcode == 'enablewsdescription') {
+            if (error.errorcode == 'enablewsdescription') {
                 return rejectWithCriticalError(error.error, error.errorcode);
             }
 
@@ -298,13 +296,13 @@ export class CoreSitesProvider {
                 siteUrl = treatedUrl;
             }).catch((secondError) => {
                 // Do not continue checking if WS are not enabled.
-                if (secondError.errorcode && secondError.errorcode == 'enablewsdescription') {
+                if (secondError.errorcode == 'enablewsdescription') {
                     return rejectWithCriticalError(secondError.error, secondError.errorcode);
                 }
 
-                error = secondError || error;
-
-                return Promise.reject({ error: typeof error == 'object' ? error.error : error });
+                // Return the error message.
+                return Promise.reject(this.textUtils.getErrorMessageFromError(error) ||
+                        this.textUtils.getErrorMessageFromError(secondError));
             });
         }).then(() => {
             // Create a temporary site to check if local_mobile is installed.
@@ -385,11 +383,11 @@ export class CoreSitesProvider {
             data.service = 'c';
         }
 
-        const promise = this.http.post(siteUrl + '/login/token.php', data).timeout(CoreConstants.WS_TIMEOUT).toPromise();
-
-        return promise.catch((error) => {
-            return Promise.reject(error);
+        return this.http.post(siteUrl + '/login/token.php', data).timeout(CoreConstants.WS_TIMEOUT).toPromise().catch(() => {
+            // Default error messages are kinda bad, return our own message.
+            return Promise.reject({error: this.translate.instant('core.cannotconnect')});
         }).then((data: any) => {
+
             if (data.errorcode && (data.errorcode == 'enablewsdescription' || data.errorcode == 'requirecorrectaccess')) {
                 return Promise.reject({ errorcode: data.errorcode, error: data.error });
             } else if (data.error && data.error == 'Web services must be enabled in Advanced features.') {
diff --git a/src/providers/utils/text.ts b/src/providers/utils/text.ts
index 7ae4cecbf..668d3589d 100644
--- a/src/providers/utils/text.ts
+++ b/src/providers/utils/text.ts
@@ -407,6 +407,10 @@ export class CoreTextUtilsProvider {
      * @return {string} Error message, undefined if not found.
      */
     getErrorMessageFromError(error: any): string {
+        if (typeof error == 'string') {
+            return error;
+        }
+
         return error && (error.message || error.error || error.content || error.body);
     }