Index: univention-management-console-frontend/debian/changelog
===================================================================
--- univention-management-console-frontend/debian/changelog	(Revision 74564)
+++ univention-management-console-frontend/debian/changelog	(Arbeitskopie)
@@ -1,3 +1,9 @@
+univention-management-console-frontend (5.0.63-51) unstable; urgency=medium
+
+  * Bug #40492: Hide overflow on session timeout 
+
+ -- Jürn Brodersen <brodersen@univention.de>  Fri, 18 Nov 2016 10:50:33 +0100
+
 univention-management-console-frontend (5.0.63-50) unstable; urgency=medium
 
   * Bug #42357: The maximum request size can now be configured via the UCR variable
Index: univention-management-console-frontend/umc/dialog/LoginDialog.js
===================================================================
--- univention-management-console-frontend/umc/dialog/LoginDialog.js	(Revision 74564)
+++ univention-management-console-frontend/umc/dialog/LoginDialog.js	(Arbeitskopie)
@@ -26,7 +26,7 @@
  * /usr/share/common-licenses/AGPL-3; if not, see
  * <http://www.gnu.org/licenses/>.
  */
-/*global define console window setTimeout require*/
+/*global define, console, window, setTimeout, require*/
 
 define([
 	"dojo/_base/declare",
@@ -222,7 +222,7 @@
 						}));
 						return;
 					}
-					if (name == 'umcLoginForm') {
+					if (name === 'umcLoginForm') {
 						this._submitFakeForm();
 					}
 					// FIXME: if custom prompts and(!) new password is required we should just switch the view
@@ -252,7 +252,7 @@
 			});
 
 			// validate new password form
-			if (name == 'umcNewPasswordForm' && newPasswordInput.value && newPasswordInput.value !== newPasswordRetypeInput.value) {
+			if (name === 'umcNewPasswordForm' && newPasswordInput.value && newPasswordInput.value !== newPasswordRetypeInput.value) {
 				this.set('LoginMessage', '<h1>' + _('Changing password failed') + '</h1><p>' +  _('The passwords do not match, please retype again.') + '</p>');
 				return;
 			}
@@ -466,6 +466,7 @@
 		_show: function() {
 			var deferred;
 			query('#umcLoginWrapper').style('display', 'block');
+			query('html').style('overflow', 'hidden');
 			query('#umcLoginDialog').style('opacity', '1');  // baseFx.fadeOut sets opacity to 0
 			this._setFocus();
 			if (has('ie') < 10) {
@@ -518,6 +519,7 @@
 			// hide the dialog
 			var hide = lang.hitch(this, function() {
 				query('#umcLoginWrapper').style('display', 'none');
+				query('html').style('overflow', '');
 				Dialog._DialogLevelManager.hide(this);
 				this.standby(false);
 				try {
Index: univention-management-console-frontend-theme/debian/changelog
===================================================================
--- univention-management-console-frontend-theme/debian/changelog	(Revision 74564)
+++ univention-management-console-frontend-theme/debian/changelog	(Arbeitskopie)
@@ -1,3 +1,9 @@
+univention-management-console-frontend-theme (1.0.4-6) unstable; urgency=medium
+
+  * Bug #40492: Show session timeout dialog centered to the viewport 
+
+ -- Jürn Brodersen <brodersen@univention.de>  Fri, 18 Nov 2016 10:53:45 +0100
+
 univention-management-console-frontend-theme (1.0.4-5) unstable; urgency=medium
 
   Bug #38622:
Index: univention-management-console-frontend-theme/dijit-claro-stylus/site/login.styl
===================================================================
--- univention-management-console-frontend-theme/dijit-claro-stylus/site/login.styl	(Revision 74564)
+++ univention-management-console-frontend-theme/dijit-claro-stylus/site/login.styl	(Arbeitskopie)
@@ -1,10 +1,11 @@
 @import "../variables";
 
 #umcLoginWrapper {
-	position: absolute;
+	position: fixed;
 	height: 100%;
 	width: 100%;
 	display: none;
+	overflow: auto;
 }
 
 #umcLoginDialog, .umcLoginDialog {