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I'm new to the Minecraft server world and I have a question: is it possible to let multiple users play on the same account on my Minecraft server?

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why would you ever need 2 players with the same name in the server –  IrishPersonality Feb 24 '12 at 17:53
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2 Answers

up vote 7 down vote accepted

No

You can never have more than one person using an account for multiplayer at a time, unless they are playing on different servers with at least one having authentication turned off.

If 2 players connect to the same server with the same name, the server will kick the first one to connect off.

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TL;DR: Yes, but it's more work than it's worth.

If it's your server, it is possible to turn off authentication on the server (the call-home check) and not log into minecraft on the client, but everyone who doesn't log in will get the name "Player" - and guess what, there's only one "Player" allowed on the server - the second user will kick off the first, so, yay, you traded the usefulness of authentication for one extra user.

Turning off authentication also means you lose things like whitelisting; and you will need to find another way to control access to your server - say, a VPN, which is beyond the scope of this answer. IMO whitelisting is too useful, although I get that authentication it is effectively a rather nonintrusive DRM.

It is possible to write a proxy on the server that intercepts the login packet with the name "Player" and replaces it with, say, the hostname of the computer used (only really reliable on a LAN or VPN scenario; useless on internet at large where IP addresses change).

This was useful when the login servers would flake out in the 1.8/1.9 era; I could still play on the one private server on my friend's VPN. However, the login servers haven't been flaky for at least a few months, so I don't even know if it still works.

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You don't need to play around with any VPN crap. Just use bukkit and xAuth, disable the built-in authentication and people can connect using a cracked client. –  user24193 Apr 20 '12 at 7:02
    
I assume vanilla server. Adding in a modded server opens up more options. –  Broam Apr 20 '12 at 19:42
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protected by Community Jun 10 '12 at 12:36

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