Some users on IHOSTLLC09 have reported problems loading their ASP.NET based sites. Upon further investigation we have discovered that some IIS sites have failed to register a correct .NET ISAPI filter after we have updated .NET version on the server to .NET 3.5 SP1.
As the result sites that have failed to register a correct .NET ISAPI filter failed to load reporting various errors. Currently we are executing aspnet_regiis in order to force .NET ISAPI registration on the entire server. We anticipate this process to complete in 10 to 15 minutes followed by JIT recompilation of all .NET based sites on the server.