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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 Oct 27, 2012@asofold is the PlayerMove EventException bug fixed in the latest dev build? Just wondering because it looks like several bugs were fixed bug I didn't see anything about it.
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Posted Oct 27, 2012@asofold
Sir. You work very fast. You're new dev build is working fine on my end XD
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Posted Oct 27, 2012@mikegeitz
Yes that is a consistency check, those are assumed to be instantly breakable with that build.
I am currently guessing some random values and assign them to those blocks.
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Posted Oct 27, 2012Only one problem for me using build 193 with 1.4.2 R0.1:
0:06:25 [WARNING] [NoCheatPlus] The block breaking data is incomplete, default to allow instant breaking:
00:06:25 [WARNING] Missing entries 00:06:25 [WARNING] * MISSING 137(COMMAND) 00:06:25 [WARNING] * MISSING 138(BEACON) 00:06:25 [WARNING] * MISSING 139(COBBLE_WALL) 00:06:25 [WARNING] * MISSING 140(FLOWER_POT) 00:06:25 [WARNING] * MISSING 141(CARROT) 00:06:25 [WARNING] * MISSING 142(POTATO) 00:06:25 [WARNING] * MISSING 143(WOOD_BUTTON) 00:06:25 [WARNING] * MISSING 144(SKULL) 00:06:25 [WARNING] * MISSING 145(ANVIL)
Otherwise appears to be working on both my servers, thanks for the quick update.
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Posted Oct 27, 2012Error: http://pastie.org/5126098
Edit: Ah wait, did not see you already had a dev-build. I will try this.
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Posted Oct 27, 2012@aaomidi
CraftBukkit is stable ?
I will put something on jenkins soon...
Quick adaption for CB 2406: NCP build 193 (http://www.nocheatplus.org:8080/job/NoCheatPlus/).
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Posted Oct 27, 20121.4.2 errors are as follows: Startup is completely fine. On login instant spam: http://pastie.org/5125992
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Posted Oct 27, 2012EntityDamageByEntity Event broke http://pastie.org/5125991 newest 1.4 bukkit
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Posted Oct 27, 2012@asofold
Broke with 1.4.2 Just letting the creators know :P
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Posted Oct 27, 2012@xATon2x
I will have a look as soon as possible. You are putting your server on CraftBukkit on the day of the release of 1.4 (MC) ? Brave ...
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Posted Oct 27, 2012@asofold
This is urgent. Nocheatplus gets errors with bukkit 1.4.2 http://pastebin.com/MDrAgKwM PlayerMoveEvent doesn't work. New nodus is out, and I can't afford to put server up with NCP outdated.
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Posted Oct 27, 2012@rfsantos1996
Is it urgent? It says "interprete" as stone but it actually it should make themn insta breakable.
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Posted Oct 27, 2012http://dl.bukkit.org/downloads/craftbukkit/view/01482_1.4.2-R0.1/ Can you update your block list? http://pastebin.com/rKHuQWJD
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Posted Oct 27, 2012@MutinyCraft
Just to have it on top:
Hotfix for books with enchantments (aggressive: removes enchantments) in build 190: http://www.nocheatplus.org:8080/job/NoCheatPlus/190/
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Posted Oct 27, 2012@asofold
Thanks. :)
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Posted Oct 27, 2012@MutinyCraft We are aware of the issue and will put a build on jenkins to prevent use of such books.
Build 190: http://www.nocheatplus.org:8080/job/NoCheatPlus/190/
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Posted Oct 27, 2012@MutinyCraft
that looks like tim the enchanter plugin lol
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Posted Oct 27, 2012There is a major exploit with MC 1.3.2 that allows you to enchant books with super high enchants. See this screenshot. I am using CB 1.3.2 R2 and NCP 3.7.8-RC-b182.
To the developers: Please send me a private message and I can provide more information. I didn't know which one of you to PM so I will let whoever wants to tackle this PM me.
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Posted Oct 27, 2012@Sk8Sanctified
Not yet as far as I know. Just ask @asofold over there for more help, I think he already started working on that.
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Posted Oct 27, 2012@MyPictures
Does the compatnocheatplus support MagicSpells?