diff --git a/SWADroid.apk b/SWADroid.apk
index 86ea53bc..a4fca5af 100644
Binary files a/SWADroid.apk and b/SWADroid.apk differ
diff --git a/SWADroid/res/values-es/strings.xml b/SWADroid/res/values-es/strings.xml
index 8b488797..5c2494d3 100644
--- a/SWADroid/res/values-es/strings.xml
+++ b/SWADroid/res/values-es/strings.xml
@@ -2,7 +2,7 @@
 <resources>
     <string name="app_name">SWADroid</string>
     <string name="serverName_preferences">Servidor</string>
-    <string name="serverSummary_preferences">Servidor (sin http://)</string>
+    <string name="serverSummary_preferences">Servidor (sin http://, vacío para servidor por defecto)</string>
     <string name="serverTitle_preferences">Servidor</string>
     <string name="loginModuleLabel">Conectar</string>
     <string name="notificationsModuleLabel">Notificaciones</string>
@@ -111,9 +111,8 @@
 		molestias.</string>
     <string name="errorBadLoginMsg">Usuario o contraseña incorrectos</string>
     <string name="errorServerResponseMsg">Error en respuesta del servidor</string>
-    <string name="errorConnectionMsg">Error durante la conexión con el servidor</string>
-    <string name="errorTimeoutMsg">Tiempo de espera agotado intentando conectar con el
-		servidor</string>
+    <string name="errorConnectionMsg">Error durante la conexión con el servidor.\nPor favor, compruebe que la URL del servidor en la ventana de configuración es correcta.\nSi tiene dudas, deje el campo vacío para establecer el servidor por defecto.</string>
+    <string name="errorTimeoutMsg">Tiempo de espera agotado intentando conectar con el servidor</string>
     <string name="sendingMessageMsg">Enviando mensaje...</string>
     <string name="messageSendedMsg">Mensaje enviado</string>
     <string name="messageSendErrorMsg">Error al enviar el mensaje. Compruebe los datos introducidos</string>
diff --git a/SWADroid/res/values/strings.xml b/SWADroid/res/values/strings.xml
index 231d5120..8cbbdb11 100644
--- a/SWADroid/res/values/strings.xml
+++ b/SWADroid/res/values/strings.xml
@@ -2,7 +2,7 @@
 <resources>
     <string name="app_name">SWADroid</string>
     <string name="serverName_preferences">Server</string>
-    <string name="serverSummary_preferences">Server (without http://)</string>
+    <string name="serverSummary_preferences">Server (without http://, empty for default server)</string>
     <string name="serverTitle_preferences">Server</string>
     <string name="loginModuleLabel">Login</string>
     <string name="notificationsModuleLabel">Notifications</string>
@@ -109,7 +109,7 @@
 		data have been deleted.\n\nSorry.</string>
     <string name="errorBadLoginMsg">Incorrect user or password</string>
     <string name="errorServerResponseMsg">Error in server response</string>
-    <string name="errorConnectionMsg">Error while connecting to server</string>
+    <string name="errorConnectionMsg">Error while connecting to the server.\nPlease check that the URL of the server in preferences is correct.\nIf you are unsure, leave empty to set the default server.</string>
     <string name="errorTimeoutMsg">Timeout trying to connect to the server</string>
     <string name="sendingMessageMsg">Sending message...</string>
     <string name="messageSendedMsg">Message sended successfully</string>