I setup ZeroTier 1.12.1 docker on Unraid 16.12.4, moreover I have Gitea (at docker) on same host, and Gitea claim about "port in use"
And yes, host say
root@Tower:~# lsof -i :22
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
sshd 17749 root 3u IPv4 80233634 0t0 TCP 10.147.20.xxx:ssh (LISTEN)
sshd 17749 root 4u IPv4 80233636 0t0 TCP fffffffff:ssh (LISTEN)
Not sure - why we are need listened ssh at ZeroTier network from docker?