We have around 60 of the IBM R/S 6000 servers at different locations. Each one has 4 network ports. For some reason every so often,seems to happen after reboots the most, the port the cat 5 cable is plugged in stops working and we have to have the workers move the cat 5 to a different NIC port. We thought about disabling the other NIC ports but were scared that if we couldn't get that port working we would end up having to make a trip to that store. Usually if we move the cord to another port it starts working again but the next time the server reboots we end up having to move it again.
This seems to happen at the same location about 3 straight weeks and then it fixes itself. Any ideas of what could be causing this?