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Editorial Team
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Asked: 2026-05-20T13:00:16+00:00

I try to istanciate a Com dll(developped in VB6) from a .Net Framework 3.5

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I try to istanciate a Com dll(developped in VB6) from a “.Net Framework 3.5 Dll Library Project” and I get the following error:

Retrieving the COM class factory for component with CLSID {…} failed due to the following error: 800aea5f.

On the same machine I try to istanciate the COM dll from a VBScript and it’s work fine.
In addition I tried to unregister and re-register the dll without good results.

Now from a windows applcation .net 3.5 I can istanciate the COM dll but it’s impossible to do from a web application (also with and without impersonate configuration into web.config)

DCOM properties:
General –> Authentication = Default
Security –> All properties = Default
Identity –> Identity = The launcher user

Any suggestions?

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1 Answer

  1. Editorial Team

    The error is link to User Permissions.

    The call’s tree is: WebApplication –> WcfService –> .Net 3.5 dll –> COM dll

    Even if I set a local user impersonation on WebApplication web.config, WcfService use the user associate to VirtualDirectory’s Application Pool that is “NETWORK SERVICE”.

    Just I change ApplicationPool’s Default User to LocalSystem the call to COM work fine

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