MSXML3.dll 80072efd and 800c0005 errors executing ServerXMLHTTP.send in classic ASP on Windows 7

Question

I have a classic ASP page that I am trying to debug on IIS on Windows 7. The page works fine on another machine running Windows Server 2003 on a different network. Also, on

Answer 1

Solved it for my case, there are plenty of other reasons you might get this error though. The short answer for me was: Check the user the Classic .Net AppPool is running as and make sure your network allows them internet access.

I downloaded Microsoft Network Monitor and looked at the traffic during a failure. The only traffic that might have been related was all going to our proxy server and consisted of a failed attempt to authenticate.

I then checked the app pools in IIS and sure enough the Classic .Net AppPool was set to use a local machine account that wasn't being recognised by the proxy. Changing the account to use to a domain account fixed the error.