This post is mostly just informational, since I didn't much helpful information regarding this on google / here.
My Initial Problem:
mrouter (part of the Linux Sophos Managed Client) was listening on it's default port of 8194. This was causing a conflict with some custom software ran on this particular server (which can't be changed for now).
Since we have a lot of clients (and I don't control the management server), changing the port for everyone wasn't an option. If you have that option, I suggest you go with that. Less likely to cause complications down the road.
My solution:
After much searching, I found the file responsible for starting the mrouter process: /opt/sophos-av/bin/_/savdctl
(that's actually a shortcut to the real file which resides in the same directory, but I suggest just referencing the shortcut in case your configuration files are slightly different than mine)
This file is VERY sensitive to changes, and will stop working if you change the overall number of characters within so use a SAFE text editor (such as vi) to make your modifications. Search for the default port (8194) and you'll fine a string of readable text that reads something like ^Z^@^@^@iiop://:8193/ssl_port=8194s^E^@^@^@. Change bolded and underlined portion to the port you desire, keeping in mind that you need to avoid changing the number of characters in the file to not break things.
Save the file, and restart sav-rms (RHEL: service sav-rms restart). If the service restarts successfully, verify that mrouter is listening on the proper port now (i.e. "ps -ef | grep mrouter" or "netstat -puntl | grep mrouter"). If restarting the service failed, make sure you didn't change the number of characters in the file you edited. Undo your changes, see if it starts up properly then.
That's it. If someone has a less ghetto way of accomplishing this, PLEASE let me know.
There are a number of configuration files under the /opt/sophos-av/ folder than look like they'd be responsible for this but changes there have no effect ("/opt/sophos-av/rms/router.config", "/opt/sophos-av/rms/MRInit.conf", and "/opt/sophos-av/rms/conf/MRInit.conf").
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