Okay, I enabled kerberos logging as per this article: http://support.microsoft.com/?kbid=262177 There's now a couple of kerberos error messages in my event log, I don't know if they were caused by IIS or not. Error Code: 0xd KDC_ERR_BADOPTION and Error Code: 0xd KDC_ERR_BADOPTION. I'll have...