First thing to try would be to re-load the port from the 3300/MCD using Maintenance Command "load ipdevice <device number>". You can find the device number by doing "locate feature extension <port extension>".
If that doesn't work, you'll have to SSH in to the Nupoint text console, and exit out to the MSL shell. From there, you can do a "ps -ef |grep mitaiM" to pull up a list of the mitaiMonitor tasks for each port, then do a "kill -9 <pid>" on the pid (process ID) of the port in trouble. If that doesn't work, do the same process on the vmemo task instead of the mitaiMonitor. If that doesn't work, restart NuPoint.