The subject behavior will occur if you have NOT enabled the Active Server Pages (ASP) Web service extension in IIS 6.0.
NOTE: ASP is NOT enabled by default in IIS 6.0.
To enable ASP:
1. Open IIS Manager from the Administrative Tools folder.
2. Select Web Service Extensions in the left-hand pane.
3. Select Active Server Pages in the right-hand pane and press Allow.
4. Exit IIS Manager.