diff -Naur SOGo-2.3.23.orig/UI/MainUI/SOGoRootPage.m SOGo-2.3.23.new/UI/MainUI/SOGoRootPage.m
--- SOGo-2.3.23.orig/UI/MainUI/SOGoRootPage.m	2017-10-18 17:22:39.000000000 +0200
+++ SOGo-2.3.23.new/UI/MainUI/SOGoRootPage.m	2018-02-18 13:22:24.000000000 +0100
@@ -185,6 +185,7 @@
   SOGoUserDefaults *ud;
   SOGoUser *loggedInUser;
   NSString *username, *password, *language, *domain, *remoteHost;
+  NSString *ousername;
   NSArray *supportedLanguages;
   
   SOGoPasswordPolicyError err;
@@ -198,6 +199,7 @@
 	    authenticatorInContext: context];
   request = [context request];
   username = [request formValueForKey: @"userName"];
+  ousername = username;
   password = [request formValueForKey: @"password"];
   language = [request formValueForKey: @"language"];
   rememberLogin = [[request formValueForKey: @"rememberLogin"] boolValue];
@@ -263,7 +265,7 @@
     }
 
   if (rememberLogin)
-    [response addCookie: [self _cookieWithUsername: username]];
+    [response addCookie: [self _cookieWithUsername: ousername]];
   else
     [response addCookie: [self _cookieWithUsername: nil]];