Port failure: The entire network is functioning normally, but individual machines cannot communicate normally.

Under normal circumstances, port failure is the damage of individual ports. Check the computer with the problem first. After troubleshooting the computer connected to the port, you can replace the connected port to determine whether it is a port problem. If the problem can be solved after replacing the port, then further determine what is the cause of the port. After turning off the power, clean the port with an alcohol cotton ball. If the port is indeed damaged, you can only replace the port. In addition, whether it is a fiber port or a twisted pair RJ-45 port, you must be careful when plugging and unplugging the connector. It is recommended that it is best not to operate with electricity when plugging and unplugging.