NoCheatPlus

Detect and fight the exploitation of various flaws/bugs in Minecraft!
Introduction
NoCheatPlus attempts to prevent cheat clients from exploiting weaknesses of Minecraft or its protocol, making your server more safe. Checks cover a wide range of issues including flying and speeding, fighting hacks, fast block breaking and nukers, inventory hacks, chat spam and other types of malicious behaviour. For a more complete list have a look at the Features Page.
NoCheatPlus puts emphasis on configurability and allows you to customize actions that are carried out when a player fails a check (e.g. silent cancelling, executing commands, just logging). Bypass permissions allow to control what check to apply for which players, all checks can be deactivated in the configuration, also having the option for world-specific configuration files. Many checks allow more detailed configuration to adjust sensitivity.
Certainly NoCheatPlus is not a magical bullet, it uses a lot of heuristics and even guessing, so you will encounter false positives here and there and also not catch every single violation. Example video of how NoCheatPlus blocks cheats (outdated plugin version).
NoCheatPlus was introduced by NeatMonster, building on the code base of NoCheat by Evenprime.
Recommended
The following plugins might be useful to have a look at.
ProtocolLib
Allows NoCheatPlus to activate packet-level checks, covering a range of exploits that can't be monitored using ordinary means. Since roughly Minecraft 1.7.10, the fight.speed check can't work as expected anymore, due to changes in CraftBukkit. With ProtocolLib this can be repaired.
CompatNoCheatPlus (cncp)
Make plugins like mcMMO or MachinaCraft more compatbile with NoCheatPlus. Not all existing plugins are covered (yet), but you can leave a note or create an issue/ticket request for cncp. Phasing out: Citizens 2 should work with NCP out of the box, MagicSpells are working on compatibility too - rest will be integrated into NCP.
Orebfuscator
Orebfuscator fights all sorts of X-ray-hacks by altering the map information that is sent to the players, such that they have to mine blocks to actually reveal what is behind. Virtually a "must have". (Latest versions of Spigot contain features of Orebfuscator.)
Downloads and History of Changes
- Download officially approved versions on the Files page at BukkitDev.
- Development builds have been moved over to the Jenkins at md-5.net.
- Do not download from any other source, do not use jars other people send you.
- Change lists: Wiki (digest) | Jenkins (by build number) | GitHub (all commits).
- Source code
Plugin statistics are no longer reported to mcstats.org.
Support
Documentation Resources
- Consider first: Frequently asked Questions and Known Issues.
- Wiki (Configuration, Permissions, Commands)
- Developers might have a look at the page describing the API of NoCheatPlus.
Contact us
- Quick questions can be asked on this page,
or on IRC (Server: irc.spi.gt | Default-Port: 6667 | SSL-Port: 6697 | Channel: #nocheat | Web client: WebIRC) - For real issues or feature requests please create a new issue/ticket or add to an existing issue/ticket.
- To send information that is not to be seen by all, you can also reach us by PM to @asofold and @MyPictures. @IceAP (IRC: ICE) will also help or redirect the conversation. Please do not contact the user 'NoCheatPlus', it is for administrative purposes only and will likely not be answered in time. Keep to BukkitDev and GitHub for support, do not trust users on other forums or websites, also not if their nick names are the same as NCP staff on BukkitDev.
Please always state the output of the "ncp version" command to let us know versions in use (users of cncp also the "cncp" command).
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Posted Aug 11, 2012@hawkfalcon
no twich xD
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Posted Aug 11, 2012irc?
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Posted Aug 11, 2012he is livestreaming himself updating it right now
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Posted Aug 11, 2012@ihasamoose
Me too, i think it will be back to a workable solution next release.
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Posted Aug 11, 2012@MasterGabeMOD
NoFall is still broken. Players who are spawning after dieing die after moving from spawn. Not sure what's up with that, but I disabled nofall completely.
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Posted Aug 11, 2012@Pr4w
Ticket: http://dev.bukkit.org/server-mods/nocheatplus/tickets/122-reversed-waterwalk/
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Posted Aug 11, 2012Getting a bug with #2, people in underwater mines get teleported into the water above if they touch any water source oO Tried without NoCheatPlus and didn't have that problem
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Posted Aug 11, 2012@daboross
You can disable any check in the configuration, setting the active flag for the check to false. In case of fall damage that would be the nofall part of the moving section.
5000 blocks ...
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Posted Aug 11, 2012Is there a way to disable checking for fall damage hacks and nothing else? My server has been lagging recently and Nocheat has been randomly killing people for "avoiding 5000 blocks of fall damage"
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Posted Aug 11, 2012ah lol ok i see now where the ticket link is :-)
thx
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Posted Aug 11, 2012@daego
http://dev.bukkit.org/server-mods/nocheatplus/tickets/121-nofall-issues-at-spawn-point/
Err, i mean:
http://dev.bukkit.org/server-mods/nocheatplus/tickets/120-i-have-a-bug-with-2when-i-jump-down-from-a-t/
could be distantly related though.
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Posted Aug 11, 2012where is ticket link ?
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Posted Aug 11, 2012@daego
Made a ticket of it.
@MyPictures
I know :) , just having the handler in place allows to do this...
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Posted Aug 11, 2012I have a Bug with #2
when i jump down from a tower or building,
he say moved to quick bla bla we know,
but then, i got "teleported" some times in the air like a lag
and then land "safe" on the ground
so i lose 0-2 hearts only
with #1 i have same teleport lags but when i arrive the ground i die correctly
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Posted Aug 11, 2012@asofold
Yea that will be nice, just wanted to say that it wasn't the issue of NC+.
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Posted Aug 11, 2012@asofold
EPIC.... COME ON BUILD #3!!
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Posted Aug 11, 2012@deleted_7536780
@MyPictures
I think the zombes issue has been tested and fixed by NeatMonster, there is a good chance it will be in the next dev build (3).
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Posted Aug 11, 2012@deleted_7536780
This issue is not happening from the ZombeMod, Its a issue in Minecraft itself:http://forums.bukkit.org/threads/flymod-is-not-working-correctly.91205/page-3#post-1271034
If NC+ blocks a fly attempt then you will be notified in the console by default, I assume you do not get such warning messages in your CMD and with OP NC+ will let you bypass all checks.
@ok12Boss
That is really hard to check and block we are focusing on the main checks at the moment (fly, moving, blockbreak, blockplace,...). Anyways we do already know that issue with forcefield, we will work in it when NC+ 3.7 is stable with the CORE stuff.
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Posted Aug 11, 2012I using this plugin v3.7.... But it can't anti aura....
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Posted Aug 11, 2012@MyPictures
Its having issues blocking ZombeFly. It was working fine before, but now even though i still got the same perms, 3.7 (or any version before) is really screwy with flyMod Blocking.