I had several ports err-disable. I tried to shut/no-shut, but the ports went err-disable again.
(No mac-address was specified in the config)
Then I removed ALL port-security commands, then reinstalled them (including the "sticky" command, but NO specific MAC-addresses). They still went into err-disable.
What steps are required to insert new servers into an switchport that was configured for port-security?
I found the same problem on both 2960 and 2560 switches.