I have one HAp AC2 with zerotier running 100% on 7.4.1 - however 2 other identical devices same version will only say zerotier requesting configuration. tick allow managed addresses it will get an ip but device cannot ping any other device on network and vice versa. a restart also did not work, upgrade to version 7.5 and device is working again. day later down, restart does not help. downgrade back to 7.4.1 and device comes back online. Any suggestions - No firewalls or nat at play. somehow it seems that the device does not get configuration info from controller in controller device shows online.