After Upgrading to .NET Framework 3.5: ASP.NET Reconfiguration and Reporting Services 403 error

Due to the issues I had with the .NET Framework and SQL Server Integration Services, I had to roll back the version to 3.5 instead of 3.5 SP1.

When the upgrade from 3.0 to 3.5 was completed, I had to do a few things to get IIS working again (I was getting errors when attempting to browse to my ASP.NET web sites, and a 403 forbidden error when browsing to a Reporting Services page):

- Re-register ASP.NET (aspnet_regiis -i from the .NET Framework directory).
- Enable ASP.NET in the Web Service Extensions section of IIS Manager.
- Check that each application was set to use the correct version of ASP.NET
- Check that each application was still set to the correct Directory Security settings.

At this point, the ASP.NET web sites started working again but Reporting Services was still giving me a 403 forbidden error.

To get this resolved, I had to delete the ReportServer Virtual Directory in IIS, and then recreate it using the Reporting Services Configuration manager.

All working again!