That's the version check system that's built into Cyn.in server. It will tell you (in the footer area) when a new version is available along with url to download it. Internet connection is required for this to work, though, obviously.

That might be the error you're getting in your log, if you don't have an Internet connection configured, on your Cyn.in server.

I have Internet connection on my server but I'm still getting it.

test