Does your switch support vlans?

@rumblpak no idea at this point. I think it would be worth it to try disabling the guest on all ssid's just as a test. In theory it shouldn't matter, but perhaps there is a bug or something. It might...

@rumblpak if client and server are on the same vlan and same subnet, and it isn't a guest network then it should work. If either guest or client are on guest then it won't work.

@rumblpak yes, that's the problem. Guest networks will block any traffic that isn't destined for the wan. So any local ip's will be blocked (ie:192.168.0.0/16). Uncheck guest on those and use acl's...

@rumblpak i know this is probably a stupid question, but in addition to the above, make sure you didn't mark the SSID's as a 'guest' network.

@rumblpak yeah, that is weird. Can you ping your plex server? Or any other device on the network? Can you ping the gateway for those VLAN's?