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Failed to login (invalid session)/Bad login

Possible problems:

Error "Failed to login (invalid session)/Bad login." is usually caused when you're trying to login to the premium server with a non-premium account. If you don't own premium account, find another server. If you do own premium account and you're already logged in, try to close the game and re-join the server. If it still doesn't work check if Minecraft servers and services are online. If servers are down, take a break and come back later.

Check Minecraft services status (located on right side of page): Check now

Short answer - Possible problems:

  • Non-premium user trying to join Premium server.
  • The connection has expired and launcher needs to restart.
  • Mojang/Minecraft servers are offline.
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