Can't access jail web interfaces

So I've been trying to troubleshoot this for hours and haven't really gotten anywhere, so I thought I'd try my luck on here.

I have CouchPotato, Transmission, and Plex all installed in jails. The first two are done as plugins, but Plex I have installed from ports so that I can more easily keep it up to date. For months, I've been able to access their web interfaces just fine, no issues. Smooth sailing.

Starting yesterday, after I replaced a drive that I had RMA'd, my ability to connect to...

Can't access jail web interfaces