How to Fix a Loose Connection on an Ethernet Cable

Updated February 21, 2017

A loose connection on a network cable can cause intermittent communication problems between your computer and the rest of the network. It can cause database transactions to fail and, in extreme cases, can cause the client computer to crash. Repairing a loose connection takes only a few minutes with the right equipment.

Turn off the computer.

Remove the loose cable from the computer or network device.

Insert the RJ45 connector into the crimping tool.

Squeeze the handles of the tool firmly together until they reach a fully closed position. Crimping tools are designed to stop before damaging the plastic connector. Closing the jaws of the crimping tool completely insures the best possible connection.

Release the crimping tool's handles and remove the cable from the tool. Insert the plug of the cable into the computer or network device. Test the cable for looseness at the plug. Power on the unit.


If problems persist, remove the RJ45 connector and attach a new one. Use a cable tester, if one is available, to test the cable's continuity if new ends don't solve the problem.

Things You'll Need

  • RJ45 crimping tool
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About the Author

Finn McCuhil is a freelance writer based in Northern Michigan. He worked as a reporter and columnist in South Florida before becoming fascinated with computers. After studying programming at University of South Florida, he spent more than 20 years heading up IT departments at three tier-one automotive suppliers. He now builds wooden boats in the north woods.