First of all you should to check the cable connected to the port. Do not trust multimeters - use normal network analizer to measure NEXT, attenuations, wrong pairing etc.
Next, check the speed/duplex settings on both sides.
Next, monitor network traffic of your host, connected to the port. You can use WireShark (freeware tools, Google for it) for this purpose (it is available for *NIX and Windows as well).
Next localize the application generated this traffic. Tools will depend on OS you are using.
P.S. Of course, not all steps will be mandatory ;)).
Good luck!
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