Bukkit

Have you often the kick message "Logged in from another location" ? Yes?
Do you know this message say a player with your username has trying to connect on?
Do you want to stop it?yes?
So download NoAccountHack!!
But it's recommanded to have an authentification plugin with it.
THIS PLUGIN IS IN DEVLOPMENT SORRY IF THERE'S BUGS.

Description:
NoAccountHack is a plugin that stops players when they connect with the same username as an online player in offline servers.
Sometimes, when you are kicked there's a message that says "Logged in from another location".No AccountHack stops it and kick the player who tried to connect with the same username as an online player and send a message in the chat for players know a player has trying to connect with the username specified.But this plugin is not very useful if you download not an authentification system because hackers will can be connected with the account of this player when he's offline so it's recommended to download one.

Version 1.2.5_01:

Commands:
/nah - Print infos about NoAccountHack.For all by default.

Permissions:
none./nah is for all by default.Just enjoy!

Properties:
When a player trying to connect with the same username of a online player this plugin stop him and send a message to the players.

Version 1.2.5_02

new commands:
/nah.help - Minimal help about NoAccountHack.for all.
/nah.infos - Infos about NoAccountHack.for all.
/nah.getaction - Get the action to do when a hack occured.
/nah.readme - Print the NoAccountHack readme.
/nah.setaction - Help about the /setaction method.
/nah.setaction.<ban | kick | none> - Set the action to do when a hack occured ban is ban ip, kick is a kick this is the action by default, none is do nothing.

new permissions:
nah.readme - Allow access to /nah.readme.
nah.setaction - Allow acces to /nah.setaction
nah.getaction - Allow access to /nah.getaction
nah.all - Allow access to all commands of NoAccountHack.

new properties:
Added a file who define the action to do when a hack occured.
Some bug fixeds.

Version 1.2.5_03:

new commands:
none

new permissions:
none

what's new:
Some bug fixeds
Command /nah.setaction.ban removed(uncompatible with the new anti-hack system)
For the next version i will add a more performant, stable and sure system.

Version 1.2.5_04:

new commands:
none

new permissions:
none

what's new:
Some bugs fixeds.
Added a more sure system.

Version 1.2.5_05:

new commands:
none

new permissions:
none

what's new:
A lot of bugs fixeds.
The anti-hack system is now more stable.
Added a better compatibility with authentifications plugins.
/!\ IF NOACCOUNTHACK DON'T RUN TRY THE LATEST VERSION BECAUSE THERE WAS A LOT OF BUGS FIXEDS/!\

Version 1.2.5_06:

new commands:
/nah.auth - Verify if an authentification plugin is enabled and running or not.
/nah.shutdown - Shutdown NoAccountHack
/nah.reload - Reload NoAccountHack

new permissions:
nah.auth - Allow access to /nah.auth
nah.shutdown - Allow access to /nah.shutdown
nah.reload - Allow access to /nah.reload

other news:
Added CrazyLogin and OAS into the NoAccountHack's auth plugins database.
Some bugs fixeds.

Version 1.2.5_07:
new commands:
none

new permissions:
none

what's new:
All known bugs fixeds.
Now i'm sure it run.

Version 1.2.5_08:
new commands:
none

new permissions:
none

what's new:
bugs fixeds
added a more performant anti-hack system.

FILES FOR 1.2.5 RUNS FOR BUKKIT 1.3.1 TOO