Is Syncthing really need internet?

I create Syncthing docker image, but in internal network only. But Syncthing can not connect to relay, can i up my own relay, or how i can fix this problem?

Syncthing does not need a connection to the Internet, nor does it need a Relay if it can connect directly to another Device.

My advice would be to figure out why your Devices aren’t connecting to one-another. It’s likely Docker related, I would suggest you search this forum for “docker” to see what the issues might be.

While you can run your own Syncthing Relay (Syncthing Relay Server — Syncthing documentation), it will likely be a lot slower than connecting the Devices correctly.

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