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Originally posted by Stephen Genusa

Q: AspMail never works. I get Server object error 'ASP 0177:800401f3'. What is the problem?

A: This error means "Invalid class string" -- in other words the call to CreateObject failed because the name object cannot be found by the OLE sub-system. Causes include:

1. You really didn't run regsvr32 on the server after all.
2. You ran regsvr32 but it reported an error.
3. Someone modified security on part of the registry that's preventing the OLE subsystem from reading all or part of the HKEY_CLASSES_ROOT tree.
4. The name of the object you are trying to create was mispelled or is incorrect.
5. Determine if it's a permissions problem

Add the anonymous user (used by IIS) to the Administrators group. The test page then worked, proving it was a permissions problem. Do not forget to remove the anonymous IIS user from the Admin group!

6. Determine if it is a file permissions problem:

After removing the Anonymous user from the Admin group, add failure auditing to the file (smtpsvg.dll), which will determine if the file was ever accessed (by the lack of the failure event). If it isn't, this makes it clear that the failure is prior to file access but go ahead and check file/directory permissions to make sure the anonymous IIS user can access the file.

7. Check registry permissions

Using Regedt32, do find on smtpsvg.dll. Check the permissions for the key (and sub keys), and make sure that the anonymous user has read rights. Do a find on the class-id, which contains the location value, and version, and check those permissions as well.

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