Error 0x80004005 when you try to register a WebClass DLL

This article helps you resolve the problem where an unexpected error might be thrown when you register a WebClass DLL.

Original product version:   Internet Information Server
Original KB number:   307495


If you use a Microsoft Internet Information Server (IIS) application (WebClass) to create a dynamic-link library (DLL) in Visual Basic 6.0, you receive the following error message when you try to register the DLL:

DLLRegisterServer in <path to DLL> failed.
Return Code was: 0x80004005

This error message occurs when you try to register the DLL on a computer other than the one on which it was created.


The WebClass run-time files must be installed to register a WebClass DLL. This error occurs if you try to register the DLL on a computer that doesn't have the WebClass run-time files installed and registered.


To resolve this problem, use one of the following methods:

  • The best way to deploy a WebClass is to use the Package and Deployment Wizard. The Package and Deployment Wizard packages the dependent WebClass run-time DLLs when your WebClass is deployed.
  • Copy and register the Mswcrun.dll file to the computer on which you're trying to register your WebClass DLL.

Steps to reproduce behavior

  1. In Visual Basic 6.0, use the IIS Application Project option to create a WebClass.
  2. Copy the DLL to a computer that doesn't have the Mswcrun.dll file.
  3. At a command prompt, type regsvr32 WebClass DllName.dll to register the DLL.