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   Apache FAQ > D. Error Log Messages and Problems Starting Apache
Question:  Apache for Windows does not start. Error log contains this message: "[crit] (10045) The attempted operation is not supported for the type of object referenced: Parent: WSADuplicateSocket failed for socket ###". What does this mean?
Answer:

We have seen this problem when Apache is run on systems along with Virtual Private Networking clients like Aventail Connect. Aventail Connect is a Layered Service Provider (LSP) that inserts itself, as a "shim," between the Winsock 2 API and Window's native Winsock 2 implementation. The Aventail Connect shim does not implement WSADuplicateSocket, which is the cause of the failure.

The shim is not unloaded when Aventail Connect is shut down. Once observed, the problem persists until the shim is either explicitly unloaded or the machine is rebooted. Instructions for temporarily removing the Aventail Connect V3.x shim can be found here: "How to Remove Aventail Connect v3.x from the LSP Order for Testing Purposes."

Another potential solution (not tested) is to add apache.exe to the Aventail "Connect Exclusion List". See this link for details: "How to Add an Application to Aventail Connect's Application Exclusion List."

Apache is affected in a similar way by any firewall program that isn't correctly configured. Assure you exclude your Apache server ports (usually port 80) from the list of ports to block. Refer to your firewall program's documentation for the how-to.


This FAQ is from Apache Server Frequently Asked Questions

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