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TCP Library Error Message

I've got two PC's on a small private network. There is a peice of Test Equipment, also on the network, that I am trying to communicate with over TCP/IP.

 

One of the PC's can connect and communicate with the Test Equipment using a small LabWindows/CVI program, however, the second PC throws an error with the text "TCP library error message: Information not available. System error message: No Error" - I've attached the error message to this message too.

 

The two PC's are setup in the same way, and both can 'ping' the Test Equipment without issue. The error appears with the call below:

 

      ConnectToTCPServer (&g_hconversation, portNum, tempBuf, ClientTCPCB, NULL, 5000)

 

The error displayed obviously holds no useful information. Does anyone have any idea what may be causing this problem?

 

Many thanks.

 

 

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Firewall ?

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Firewall is off on all PC's.

 

Thanks for responding.

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