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Editorial Team
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Asked: 2026-06-02T16:30:25+00:00

I have a problem with a site which communicates to a C# service deployed

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I have a problem with a site which communicates to a C# service deployed on IIS7 on Windows Server 2008 (x64 version).
The service is trying to access a COM object from a third party dll. When is doing that an exception of the following form is thrown:

System.InvalidCastException: Unable to cast COM object of type 'MyClass' to interface type 'TheirInterface'. 
This operation failed because the QueryInterface call on the COM component for the interface with IID '{88B11E8A-0B27-459C-BC28-A4D4113FD4AE}' failed due 
to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

I hosted the same site on many other machines working on Windows 7, so I suppose that the problem is related to the OS (Windows Server 2008).
Any suggestion about wher I can search a solution for this exception, or if there is any configurations that should be made on the IIS?

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1 Answer

  1. Editorial Team

    You need to either run the website as a 32-bit website or use a COM object compiled against the x64 platform. In other words your COM object was unable to be load because it only supports being loaded by a 32-bit process.

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