Ubiquity: Unifi AP shows Timeout or Unknown[11]

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I’ve experienced a strange issue with my Unfi controller software: All my access points on a remote site will adopt but then get stuck in the “Adopting”/“Getting ready” state. Factory resets etc did not help in any way. Restoring from backup did also not work. When I executed the info command on the access points they returned different status values depending on the firmware:

In my case it was a MTU problem. I use WireGuard to connect the remote site to my network and that site is behind a PPPoE connection. WireGuard does not fragment packets. The solution is to lower the MTU on the access point:
Log onto the access point via ssh. Find out which interface packets originate from. The AP AC Lite uses br0 for example. Set the MTU on the link: ip link set br0 mtu 1400. Afterwards you should persist that command: echo "ip link set br0 mtu 1400" >> /etc/persistent/profile and execute save afterwards. When you reboot the access point it should come up with the right MTU again.

Please, Ubiquity! Please provide IPv6 for management! Path MTU would have fixed that issue without my manual intervention!

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