An example of the subject behavior would be if an ASP.NET Web service extension was set to Allowed in the IIS Manager MMC snap-in being set to Prohibited after the upgrade.
To workaround this behavior:
1. Log on with administrative privileges.
2. Open IIS Manager from Administrative Tools.
3. Expand <Computer Name> (local computer) and press Web Service Extensions.
4. Using the details pane, right-click each Web extension that you wish to enable and press Allow.