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Asked: 2026-05-11T05:08:24+00:00

I have been trying to access a .NET Assembly that I have created in

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I have been trying to access a .NET Assembly that I have created in classic ASP using

dim foo set foo = Server.CreateObject('TestAssembly.MyClass')

The problem is I’m getting an error:

Server object error 'ASP 0177 : 800401f3'  Server.CreateObject Failed  /test.asp, line 4  Invalid class string

I have registered the assembly (TestAssembly.dll) using gacutil and regasm as instructed in the article: Replacing Old Classic ASP COM Components with .NET Assemblies which I referenced from another question. It supplies two methods in which to install the assembly and I have tried both, but to no avail.

Getting this working would be great because it would allow me to gradually migrate a classic ASP site to .NET

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1 Answer

  1. Another thing to check: make sure your .Net assembly is set to be COM Visible.

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