I have encountered this issue maybe 2 or 3 times recently. These are two devices on the same network. They use static IPs and can communicate with each other with no problems. Syncthing is configured with the default settings regarding networking, i.e. discovery, etc. turned on, and the addresses are “dynamic”.
This is how the situation looks like.
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Device A shows Device B as “syncing” and is trying to transfer files.
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Device B shows Device A as “disconnected” and refusing to accept the connection.
If I leave them stuck like this, then maybe after 10-15 minutes they suddenly start communicating again. This is not a critical issue, since normally the two have no problems connecting to one another, but once this happens, it gets pretty annoying very quickly.
Does anyone have any idea what the culprit may be here?