Test Connection...File not Found

Good afternoon! I have combed over and over this forum as well as my site definition for this new website.

Whenever I test the connection I get this error:

HTTP Error Code 404 File Not Found. Here are some possible reasons for the problem:
1) There is no testing server running on the server machine.
2) The testing server specified for this site dow not map to the http://172.17.187.194/_mmServerScripts/MMHTTPDB.asp URL. Verify that the URL Prefix maps to the root of the site.

The _mmServerScripts folder is in the webserver root. When I put a home.html file in the _mmServerScripts directory, the URL http://172.17.187.194/_mmServerScripts/home.html works just fine. In fact, I can successfully retrieve any other file in the _mmServerScripts folder EXCEPT the critical MMHTTPDB.asp file.

Does this error even refer to the MMHTTPDB.asp file? Or some other file? If so, I cannot figure out what it cannot find.

Any idea what is causing this? I am new to DW and to windows-based website programming in general.

The DB connection is a SQL Server connection. I get the same error when I set up an OLE DB connection.

Thanks in advance.