Squid proxy

[donkey]

Hi

I'm using PFSense squid proxy server with NT domain authentication method. This has been working fine for over a year now but ever since I upgraged my DC to server 2008 r2 from 2003 the authentication is giving problems. The users can still be authenticated but after a user would change a password they can no longer be authenticated. new users also cannot be authenticated. No error message is given.

I don't know wheather the problem in on PFSense or DC.

Please help