.netwcfiis.net-4.0isapi

WCF: Handler "svc-ISAPI-4.0_32bit" has a bad module "IsapiModule"

When browsing to my .svc endpoint in a browser I get this message: Handler "svc-ISAPI-4.0_32bit" has a bad module "IsapiModule" (On 64-bit Windows the message is: Handler "svc-ISAPI-4.0_64bit" has a bad module "IsapiModule").

I can't find IsapiModule anywhere in IIS. How can I fix this?

Solution

  • 1) Make sure the appropriate IIS features are installed. Go to Control Panel > Programs & Features > Turn Windows features on or off, then select everything under Internet Information Services > Web Management Tools and World Wide Web Services, and Microsoft .NET Framework.

    2) From a Visual Studio command prompt, run the following commands:

    aspnet_regiis -i -enable

ServiceModelReg.exe -r

    3) Restart IIS.