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Editorial Team
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Asked: 2026-05-26T05:42:48+00:00

I have a 3rd party webservice that runs by posting a soap message directly

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I have a 3rd party webservice that runs by posting a soap message directly to a dll.

It runs perfectly on my development machine, but when I try and deploy it to Windows 2008 R2 64-bit using IIS 7 it fails, indicating error 404 2 1260 in the IIS7 log.

I have done all of the normal stuff, including:

  • Setting the ISAPI and CGI Restrictions,
  • Adding the Handler Mappings and setting them to Execute,
  • Setting Handler Mappings Feature Permissions to Execute

but none of that helps.

When I enable Failed Request Logging, the lowest-level detail that I can get is:

  • Error Code 0x800704ec
  • Error Code 2147943660
  • Error message IsapiModule This program is blocked by group policy

What is going on!?

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1 Answer

  1. Editorial Team

    The DLL was a 32-bit DLL.

    By default, IIS 7 running on Windows Server 2008 R2 64bit doesn’t allow 32bit dlls to run.

    There’s a little setting in the Application Pool Advanced Settings called Enable 32-Bit Applications. Set it to True in the application pool to which your web service belongs, and it should start working!

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