Could not load type ‘%SystemRoot%\Microsoft.NET\Framework64\v2.0.50727\aspnet_isapi.dll error when trying to access a WCF Service

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This error came up in an install at a client and was a pain to run down.  We couldn’t find any clear fixes on the Internet.  There was some things a little fishy in the Handler mappings, but in the end they looked correct even when compared to a server that was working.  We ran aspnet_regiis and ServiceModelReg with no meaningful effect on the issue.  Finally the sys admin working with us had the site re-inherit the mappings from the parent and voila – 3 hours of troubleshooting were resolved.  What a pain!  Sometimes computers just will drive you crazy! 

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3 Responses to Could not load type ‘%SystemRoot%\Microsoft.NET\Framework64\v2.0.50727\aspnet_isapi.dll error when trying to access a WCF Service

  1. Brett says:

    I thought this kind of stuff was only supposed to happen on Linux machines! 🙂

  2. gold price says:

    You can override these mappings at the machine level by adding this section to machine.config and modifying the mapping for each protocol scheme. Or if you’d only like to override it within the scope of an application, you can override this section within your application/web configuration file.

  3. Pingback: Could not load type ‘%SystemRoot%Microsoft.NETFramework64v2.0.50727aspnet_isapi.dll error when trying to access a WCF Service - Bryan Hinton's Blog

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