InvalidCastException for COM object in Windows Server 2008

Question

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?

Security Hound · Accepted Answer · 2012-04-25 14:07:17Z

2

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.

answered Apr 25, 2012 at 14:07

Security Hound

2,5183 gold badges26 silver badges46 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

InvalidCastException for COM object in Windows Server 2008

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related