My pfSense router upgrade did not go so well… Diagnostics My pfSense router stopped working. No Internet, no DHCP, no nothing. A simple reboot failed to resolve the problem. And no, I did not try restarting three times. A USB-to-RS232 adapter is worth its weight in gold. Has been that way for years. If you don’t already have one with a null modem cable, I suggest you get one in a hurry.