I found the resolution to this today. Basically when we turned on the SSO option in WI some users would get an HTTP 400 Bad request page. If you clicked refresh it would work. Also if you used the IP address it would work for the same user. Other users could use the WI page without issue If you have a large AD infrastructure it is possible to have a large Kerberos ticket. IIS can't handle this without a few tweaks. for IIS 5.0 for increase HKLM\System\CCC\Services\W3SVC\MaxClientRequestBuffer for IIS 6 increase HKLM\System\CCC\Services\HTTP\MaxFieldLength and MaxRequestBytes We used 32768. Hope this helps somebody else. Malcolm ________________________________ From: thin-bounce@xxxxxxxxxxxxx on behalf of Malcolm Bruton Sent: Mon 26/03/2007 14:18 To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Web Interface Single Sign On Built a new WI 3.0 box today to play with and it worked without issue. Might be time to either bounce my WI boxes which have been up the last 6 months or blat the config and put it back. Malcolm From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of christopher.walter@xxxxxxx Sent: 23 March 2007 13:43 To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Web Interface Single Sign On I've had this before and it was one of two things: 1. Try put the following in the registry on the any servers you have in your serverlist within the web interface. 2. Try changing the servers in your serverlist. If this works then chances are one of the servers in your server list is having performance problems. I had this same problem back about 6 months ago and can't remember which one I did to fix it. Thanks, Chris -----Original Message----- From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Malcolm Bruton Sent: Friday, March 23, 2007 6:49 AM To: thin@xxxxxxxxxxxxx Subject: [THIN] Web Interface Single Sign On Have been running Web Interface 3 for some time. If I check the Single sign-on check box. Any users that now go to WI get a page not found error. However if I try the same directly on the WI server it works fine. Ideas? Client setting? Malcolm