If you're using Linux Ubuntu / Debian with Java OpenJDK (Spigot, Craftbukkit, Forge, etc.) and having issues with Minecraft clients showing Mojang's "Authentication Servers Are Down", run the following command and restart Minecraft and the server.

update-ca-certificates -f
Hjälpte svaret dig? 30 användare blev hjälpta av detta svar (714 Antal röster)