Syncthing: breaking upgrades

Syncthing is usually very easy to upgrade: it upgrades itself silently or via apt-get. Problem is, when it changes version (lastly from 0.12 to 0.13) it is not compatible anymore. It is not a big problem since it is easy to upgrade, but you kind of have to upgrade your entire Syncthing cluster at the same time, otherwise you get an undesired fork.

This was the quite confusing error message i got on the newly updated system that failed to connect to non upgraded systems:

[THC2C] 19:17:52 INFO: Failed to exchange Hello messages with <ID> (<ADDRESS>): EOF

So, be mindful when upgrading syncthing so you dont get a non breaking upgrade when you dont have time to upgrade everything.

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