Hi! I got: 3x Linux machines, GBit LAN; 1x Windows, GBit LAN; 1x Android, WiFi; all connected by the same Fritzbox router.
All devices connect via syncthing, except the Windows box and the important Linux server.
Ping is ok, IPs are in host files, the Linux server is even remote controlled via web and ssh by the Windows machine and SMB file sharing works. All machines use the same ports 22000 and 21027. These are open in the firewalls (just the windows internal and one linux client use a firewall).
One Linux machine was especially ‘connecty’, so I made it the introducer. Later I activated this at the Linux server, too.
I tried: “tcp://host:port” and dynamic configurations, quite some restarts, pings, new connections, new shares, local discovery is activated, global discovery on and off, relaying off (was on several times) … waited for hours… but these two machines don´t connect.
When both are configured with each others tcp:// addresses, the windows box tells something like “the connection could not be established because the target computer refuses the connection.” (but in german). The Linux machine comes up with a simple: i/o timeout (20:40:35).
If I put files in the shared folders, it seems to be syncd via the other clients.
What can I do to help them connect or diag what is wrong?