When accessing the Symantec Management Console from one computer you get an error that:
You currently do not have sufficient network access rights to the Notification Server console.Please contact your local area network administrator for further assistance.
However, if logged into a different computer with the same credentials, access is allowed without the error.
ITMS 8.x
Windows Credentials were cached on the computer with the issue and it was substituting a set of cached credentials for the credentials that the user was loged in with.
You should now be able to open the console and have the correct (currently logged-in user) credentials passed to IE and have the correct access to the Symantec Management Console.