Web services may fail on Microsoft Internet Information Services (IIS) 7.5 and Windows 7 Service Pack 1 with .NET Framework 4.0 due to extensionless URL handlers
Ran into this issue with Helicon ISAPI Rewrite 3. Running a side by side cshtml layout asp.net razor web pages is conflicting with Helicon ISAPI Rewrite which was a previous install on the Windows Server 2008 R2. Web services may fail on Microsoft Internet Information Services (IIS) 7.5 and Windows 7 Service Pack 1 with .NET Framework 4.0 due to extensionless URL handlers