diff --git a/management/univention-management-console-frontend/umc/tools.js b/management/univention-management-console-frontend/umc/tools.js
index cf91840..d9dace4 100644
--- a/management/univention-management-console-frontend/umc/tools.js
+++ b/management/univention-management-console-frontend/umc/tools.js
@@ -417,6 +417,9 @@ define([
 			/*Object?*/ longPollingOptions) {
 
 			// build the URL for the UMCP command
+			if (command == 'auth' && dialog._loginDialog) {
+				dialog._loginDialog.set('LoginMessage', '');
+			}
 			if (!(/^(get\/|set$|auth|logout(\/|$)|saml(\/|$))/i).test(command)) {
 				command = 'command/' + command;
 			}