Soon after starting the service, the log is full of entries (see below) and the service fails to listen on the configured port, finally picking a (seemingly) random port to listen on.
sync version:
2.6.3 (1340) (server)
[2019-11-21 10:25:17.607] class PeerListenConnection::Socket::listen[0x000001a23ecafb40][596] bound listening socket 596 to IP 0.0.0.0:56125
[2019-11-21 10:25:17.607] class PeerListenConnection::Socket::listen[0x000001a23ecafbc0][1028] bound listening socket 1028 to IP [::]:56125
[2019-11-21 10:25:17.607] UDP: UDP port bind failed 0.0.0.0:56125: (10048) Only one us