Hello all:

Im running TMG with 2 nics in my environment.  All of my clients are web proxy clients.  The proxy settings have been setup with group policy in IE on all my machines.  From time to time my end users are getting denied access to the internet because they are not authenticated.  Strange thing is sometimes the issue goes away and sometimes it doesnt.  My internet access rule on TMG requires authentication hence the reason they are blocked.  The only workaround I have found is to put these machines in a specific rule that doesnt require authentication (something I dont want to do).  I have done some network captures using MS Network Monitor when this happens however I cannot make any sense of them.  Im hoping someone here can help me with this issue as its very frustrating. 

Thanks

zack

Hi,

did you checked your configuration with the following article:

http://technet.microsoft.com/en-us/library/bb794787.aspx

Marc:

Thanks for your prompt reply. I looked over the article however im not sure if it applies to me here.  In looking through the logs on TMG whenever the issue happens I get this...

Im at a loss here as to what the issue may be.  My internet access rule is setup for "All Authenticared Users"  Im using integrated authentication if that helps.

Hi,

Thank you for the post.

Please refer to this blog: http://blogs.technet.com/b/isablog/archive/2011/01/13/random-authentication-prompts-while-accessing-internet-through-isa-server-followed-by-isa-server-becoming-unresponsive.aspx

Regards,