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I installed a fresh Forge (1.8.9-11.15.1.1722) server (with Sponge 1.8.9-1691-3.1.0-BETA-1046). The host (running Debian) is headless, Minecraft starts correctly, but one line in the startup log is worrisome:

[main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing

There are no more errors (only INFO messages). I believe that FML means Forge Mod Loader, which then appears with its own log messages (like [FML]: Forge Mod Loader has successfully loaded 4 mods) and otherwise the server works fine (at least seems to do so, I connected from a client and walked around without issues.

Is this something I should be worried about?

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  • Did some googling... are you using the original launcher? It sounds like you shouldn't be worried unless the game breaks. – aman207 Feb 22 '16 at 20:13
  • @aman207: I googled the message as well but found nothing. I use a headless server, not sure what you mean by "original launcher"? (sorry, this is my first minecraft server and I went according to the docs - I will update my question with these two points) – WoJ Feb 22 '16 at 20:15
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Is this something I should be worried about?

[main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing

tl;dr, Nope.

Unless you have downloaded Minecraft Forge from a sketchy location, it's something you do not need to be worried about.

That basically means that it could not verify the file's integrity. It's nothing important, unless you're wary of viruses, etc.
Also, this error mostly happens when you use the Universal version of Forge.

The only thing you need to worry about is whether the game server runs or not (throws an exception and goes to the console/launcher/crash screen).

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