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I'm using a server I bought a while ago to run a Minecraft server for my friends, and while setting it up, I had an issue where whenever I connected, it said "Authentication servers are down. Please try again later, sorry!" The server logs would also show the message: "Couldn't verify username because servers are unavailable." Clearly this wasn't an issue on Mojang's end, because I could connect to other servers, and I could also ping authserver.mojang.com.

For the time being, I have set online-mode=false, though I am controlling access using a whitelist. For reasons of both security and features (like skins), I'd like to switch to online mode. Any ideas on how to start troubleshooting? I imagine if there was a way to make the logs more verbose that would help.

OS is Debian 9, Minecraft Server version is 1.16.4. I have both OpenJDK 1.8.0_275 and 11.0.6 (from backports) installed; currently I am using 1.8.0_275 but the same issue occurs on both versions. At the moment I have no hardware or software firewalls.

Ivan Stanton
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  • Does this help answer your question? https://gaming.stackexchange.com/questions/96496/is-there-a-list-of-error-codes-for-minecraft – Eris Starmaster Jan 05 '21 at 12:59
  • @Eristheguest Not really. The closest error listed is "the authentication servers are currently down for maintenance" - as I already stated they clearly aren't down, and my cloud provider is not blocking the servers either. – Ivan Stanton Jan 05 '21 at 21:06
  • Close enough, and that error CAN occur even if they ARE up. – Eris Starmaster Jan 06 '21 at 12:32
  • @Eristheguest I'm aware, it occurs if there is an issue of any kind preventing the server from contacting the authentication servers, but none of the suggested solutions there are helpful. – Ivan Stanton Jan 06 '21 at 14:35

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