HTTP Error 400 and OWA The size of the request headers is too long
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From: jas0n on 17 Feb 2010 16:30 Hello Running Windows 2003 / ISA 2006 SP1, publishing Outlook Web Access for 2008x64 Exchange 2007, part way through transition from 2003 with both 2003/2007 mailbox servers and 1 CAS server. I have been moving mailboxes this last week and most are fine but some users have had issues accessing Outlook Web Access, they receive an error message:- HTTP Error 400. The size of the request headers is too long It seems to be users who are members of many active directory groups, remove a lot of groups and they user can gain access. I'm trying to troubleshoot this but going around in circles, I don't appear to see any errors in the http logs on the CAS server, I'm thinking the connection doesn't reach it. I am new to ISA, what data would I be able to gather from ISA about the failed connection attempt ? I've been through http://support.microsoft.com/kb820129 with regards to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters MaxFieldLength MaxRequestBytes .... added these in on the CAS server and set to 64k but this made no difference. Also looked at 'configure HTTP' in ISA on the rules which also appear to have some header values but without some logs to look at its just hit and miss and not good practice. How do I troubleshoot this ?
From: jas0n on 19 Feb 2010 08:37
"jas0n" <no(a)thank.you> wrote in message news:OUKkAiBsKHA.1352(a)TK2MSFTNGP06.phx.gbl... > Hello > > Running Windows 2003 / ISA 2006 SP1, publishing Outlook Web Access for > 2008x64 Exchange 2007, part way through transition from 2003 with both > 2003/2007 mailbox servers and 1 CAS server. > > I have been moving mailboxes this last week and most are fine but some > users have had issues accessing Outlook Web Access, they receive an error > message:- > > HTTP Error 400. The size of the request headers is too long The problem was resolved with:- http://support.microsoft.com/kb/920862/en-us It says only relevant to Exchange 2003 but its also works for 2007, was needed on the CAS & Mailbox server, well, all Web servers in our environment, rebooted and now working. |