Authentication proxy issues... How IE/Windows handles basic authentication?

Then... got one the other day, I've not seen before.  Multi-instance, load-balanced ISA environment experiences issues where several services need to be restarted.  Everything is fine, everything is in line with service series restarts a duration of 3 to 5 minutes.

On a population of end-user well into the tens of thousands, a handful of users under Windows XP, IE v6 to v8, running, start randomly to a login and a password to authenticate to the proxy server.  Authentication is done via AD, of course, but without credentials are accepted.  Usually, if the end user just keeps hitting cancel, their web site is in place.  This occurs sporadically and intermittently throughout the day, however, and we are talking about a handful of users (for example, less than 100 of 50,000).  There is no evidence in ISA logs or logs of the OS.  The fix?  Restart the OS (XP) client.

We have examined the NTLM issues, IE version problems (couple had even IE6)... nothing seemed to be a compelling evidence on this one.  I have not found any similar discussions, KB articles, etc. so I'm a bit puzzled.

Does anyone know what either side client that could cause this?  Something unique about the way in which IE/XP manages to a proxy basic authentication...?

Here are the specific consumer forums. You will find appropriate support it in this forum-online http://social.technet.microsoft.com/Forums/en/itproxpsp/threads Pro

Tags: Windows

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