Cannot Create ActiveX Component

Apr 28, 2010

I have been working on an asp.net web application that calls a third party COM application through createObject method. The application works fine (gets initialized) in Win XP but I am having problems getting it to work in WIndows 2003. I get the "Cannot create ActiveX component" error.

The website works fine in visual studio - the application launches fine. The references added were the interop assemblies which were packed inside a tlb file.

I am aware of the change in default user - ASPNET for iis 5 and Network Service for IIS 6.0. Also I have changed the default permission levels in DCOM config for not just this COM application but all the COM applications by changing the default COM security properties of the computer. I gave almost every user the permissionto launch and access remotely including Network service and everyone.

The other thing I have done was to test it out in IIS 5.0 isolation mode but couldn't get the application work - still same error.

The final thing I have tried was to use IIS 6.0 itself but change the application pool to local system and I am just stumped that even this didn't resolve the error.

Another thing to add is that I cannot register the tlb file using regsvr32.exe command as it is not a dll.

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