I'm not sure why, but c1iscex did not want to do an mxstream restart. It would complain at me that "* ERROR: mx_stream is already stopping."
Koji suggested that I reboot the machine, so I did. I turned off the ETMX watchdog, and then did a remote reboot. Everything came back nicely, and the mx_stream process seems to be running.
* ERROR: mx_stream is already stopping.