Error in Citrix Xen Licence Server - Unable to authenticate user

I have had this problem a few times where when i try and logon to the Citrix Licence Management Console it refuses saying

You did not authenticate correctly. Please try again or contact your system administrator.

The problem in my case has always been that i have renamed the server since i installed the Licence server. I have had this problem in XenApp and XenDesktop Applications.

The Server name is hardcoded into the following file and simply needs to be edited to correct the server name.
%progfiles%\citrix\licensing\lmc\tomcat\conf\tomcat-users.xml