VFP 6.0 SP5, WC 3.65, Win2k Server SP2, IIS 5.

I continue to intermittently get the infamous error:

An error occurred during COM object invokation.
WC Server Instance not found. Err code = 80070057: The parameter is incorrect.

As Rick Strahl indicated, I have KeepAlive = 1 and the Web Server site is running in Low Isolation mode. I have checked my error logs and the COM server(s) do not appear to be crashing from internal problems ( at least as far as I can tell ). From the admin.asp page the Server Error Log is clear. The ISAPI error log in wcErrors.txt indicates only the following two entry types that seem to have anything to do with the problem:

Web Connection Request timed out...
   and
CallServer: Exception occurred prior to calling the COM server...

But these errors seem a little generic and the second one seems ( to me ) to be related more to wc.dll than the COM servers themselves and I have not been able to isolate what is generating them. Rick has indicated that this error occurs "if the COM object has repeatedly crashed or unloaded and the COM system is out of resources." However, at this point, I'm not sure what would be causing the servers to crash or unload.

Is there any other light that can be shed on this problem or things that can be done to try to narrow down the where/why the error is being generated?

Thanks,
Bill