This looks like a similar problem, http://forums.iis.net/t/1157092.aspx , but in my case it is not a dll. I just retested - same error. What I did: additional ip 10.0.0.6 new "testweb" with the ip 10.0.0.6 2 files into the folder testweb (test.htm (response text "test"), test.asp...