I am having a problem with certain machines at certain sites and the users not being authenticated.

The users see their icons fro a moment and then they disappear. The agent box shows that the user is not logged in.

I have recreated the Closest Server rule. I have deleted and re made profiles. (this did solve the issue for some users for a short while.)

When you login as a local user who is not in the Management Zone the authentication box does pop up and, as it should do, and you can login as a valid user and the same thing happens, Icons for a short while and then user logged out.

At 2 other sites where users have been upgraded there have been no issues like this.