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I would like to see how a program responds when it's connection is severed. Aside from disabling the network card, is there a way to sever a tcp connection in Windows without killing the process, or the thread that owns the connections?
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You can close established TCP/IP connections (those labeled with a state of ESTABLISHED) by selecting File|Close Connections, or by right-clicking on a connection and choosing Close Connections from the resulting context menu. You can save TCPView's output window to a file using the Save menu item.
Use the DRop/-D command to terminate an individual TCP connection when you do not want to terminate the server itself, but want only to drop an individual connection with that server. Use the DROP/-D command to terminate old TCP connections if they prevent a server from being restarted.
The closest thing that I've found to generating an OS error is to use something like TcpView to look at what sockets are open and sever them. I'm not sure exactly what it does to sever the connection, but it does close it in a way that an application can see.
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TCPView by SysInternals lets you close a connection (and see all open connections).
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