My VPS syncthing service cannot connet to my home service. Home has real IP with UPnP. In home logs I see next message:
New NAT port mapping: external TCP address 85.233.XXX.YYY:59539 to local address [::]:62351.
Detected 1 NAT service
quic://0.0.0.0:62351 detected NAT type: Port restricted NAT
quic://0.0.0.0:62351 resolved external address quic://85.233.XXX.YYY:62351 (via stun.syncthing.net:3478)
I think quic must resolve external address to 59539 port instead of 62351, because 62351 it is local port. If I write my home service address on VPS service as tcp://85.233.XXX.YYY:59539 instead of dynamic, then connection established.