We have started having some problems with some Microsoft sites, including the Windows Update sites. It would appear that they have made a change to their site which means that when acessed through Squid it fails. On windows update you get a 0x80072F78 error. http://support.microsoft.com/kb/836941 just gives a blank page in Firefox, "Internet Explorer cannot display the webpage" in IE. It works when you bypass the proxy. I am using NTLM authentication, but have tried it bypassing the authentication. There is no error from the Squid box, it just doesn't display the page. The only information I have found searching for the error messages is several years old and talks about bypassing authentication. This appears to be a recent change to the MS sites. I get this in the access.log when using the authentication 1211286171.493 37 x.x.x.x TCP_DENIED/407 1866 GET http://support.microsoft.com/kb/836941 - NONE/- text/html 1211286171.509 1 x.x.x.x TCP_DENIED/407 1881 GET http://support.microsoft.com/kb/836941 - NONE/- text/html I get this in the access.log when bypassing the Authentication 1211286186.013 128880 x.x.x.x TCP_MISS/200 16541 GET http://support.microsoft.com/kb/836941 - DIRECT/207.46.248.248 text/html 1211286188.183 126353 x.x.x.x TCP_MISS/200 16677 GET http://support.microsoft.com/kb/836941 - DIRECT/207.46.248.248 text/html 1211286171.263 130828 x.x.x.x TCP_MISS/200 16712 GET http://support.microsoft.com/kb/836941 - DIRECT/207.46.248.248 text/html I am using Squid 2.5.12-4ubuntu2.4 On Ubuntu 6.06 Server Edition. Any help would be greatfully received. Regards. Mark.