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PFSense - Troubleshooting - mbuf full

Try increase nmbclusters.

Navigate to System → Advanced → System Tunables.

kern.ipc.nmbclusters=65536

or SSH in and type:

sysctl kern.ipc.nmbclusters=65536

NOTE: You should also make the appropriate changes to /boot/loader.conf.local in order for the change to persist across reboots.

Reboot to make this change stick.