I had my H2H flood my network today, all internet access ground to a snails pace. It turns out a setting within the mg_cfg was the cause. Check file /usr/keys/mg_cfg and see if logging is being sent to a non-existant server!!
With my mg_cfg file logging was set to L: { 03 } 172.16.1.1 28007 /tmp/mgcamd.log
This server doesn't exist and even if it did, why would I want my mgcamd log content being sent to an external provider!!! hmmm!!
Anyway I updated the file by switching logging off with L: { 00 } then rebooted the machine and so far so good.