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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 20, 2012Yeah all of my players are suffocating now. Running the newest RB of CB 1.3.1R2.0. Pm me if you would like more detailed info on my plugins.....I dont want to clutter up the page. Otherwise awesome work! I honestly dont see the point of running my faction servers without NoCheat+....So much cheating as of late.........Thanks NODUS
EDIT: Thanks for updating and responding to us so quickly!
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Posted Aug 20, 2012omg, with #37 half of my world disappears and all my players that login soffoucated in a wall o_O
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Posted Aug 20, 2012@Lochpatjes I'm working on a hotfix, please wait for the build #38.
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Posted Aug 20, 2012I am having the problem that players don't get fall damage. Am i overlooking an option or is it a known issue with build #37?
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Posted Aug 20, 2012@bigscary
Yes we are chaining the NoCheatPlus server ;), and I will remove all proxy stuff from apache2 because neat needs to work later with it. Always use the Download button up there and you should be set.
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Posted Aug 20, 2012@bigscary Try the 'Downloads' button, it's linked to the Jenkins now.
Edit: To everyone using the build #36 or #37 (I deleted and re-uploaded the build #37), please re-download the plugin.
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Posted Aug 20, 2012@MyPictures
Thanks, but unfortunately, all I see on that page you linked is this:
It works!
This is the default web page for this server.
The web server software is running but no content has been added, yet.
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Posted Aug 20, 2012To everyone having the strange issue (players being teleported weirdly, etc.), feel free to add me on Skype (NeatMonster_) to show me the issue on your server because I can't reproduce it, at all, on my test server.
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Posted Aug 20, 2012ci.nocheatplus.org incorrectly redirects to nocheatplus.com:8080 instead of http://nocheatplus.org:8080
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Posted Aug 20, 2012As of build #34 and beyond, fall damage does not occur for anyone on my servers. Confirmed this by rolling back to build #33.
HighlifeTTU
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Posted Aug 20, 2012@Juliui
Yes, Build 34, sorry.
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Posted Aug 20, 2012Just updated to #36, people started to teleport weirdly, below the surface, suffocating or dieing in lava, also falling out the world. I thought this was fixed? Weird. I downgraded to 32, no issues atm.
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Posted Aug 20, 2012@ramius86
I am having the same issues. In addition it makes duplication possible in situations in death. Players been reporting if they disconnect right before death, they came back with dup items.
Happen to get "has fallen out of the world" issues?
/spawn, /help (wtf, i know new flags but still a pain...) and players eating have been issues.
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Posted Aug 20, 2012@vicente947
The rewrite is now complete, we're tracking bugs. So there will be an RB when all bugs will be fixed... It's can take three weeks or more, or just a couple of days.
@cuddyier
Build 34 you mean, no ?
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Posted Aug 20, 2012Someone have got the same problem with the last release 3.7 that block teleport, spawn, back and other commands?
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Posted Aug 20, 2012For some reason on build 44, players get pulled back when jumping and running at the same time. Using /ncp info [name] shows no violations, any idea? Also a lot of my players are suffocating in walls when they teleport anywhere with build 44, this is definately nocheatplus as it never happened before I installed it.
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Posted Aug 20, 2012When will be a RB
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Posted Aug 20, 2012@NeatMonster
Si les gens sont si exigent pour NoCheatPlus c'est parce que c'est le plugin le plus important sur un serveur ! Sans ça tout le monde flyerais ou autre se serais l'anarchie
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Posted Aug 20, 2012@cuddyier Because of people complaining about this issue, I removed the NetServerHandler proxy. So, if the issue is still there with build #34, then it doesn't come from NoCheatPlus.
@juloo65 Je peux pas rendre NoCheatPlus compatible avec chaque plugin. Par contre tu peux suggérer au développeur de DynPad d'utiliser l'API de NoCheatPlus.
Pour en revenir aux lags, les gens ont souvent tendance à tout mettre sur le dos de NoCheatPlus. Certes le plugin est lourd, mais il n'est pas à l'origine de tous les maux non plus.
@deleted_7554077 Yeah, we're doing some minor changes to the webserver. Sorry 'bout that.
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Posted Aug 20, 2012Dev build links are broken? 3.7.1 links are all broken.
Can anyone direct link me?
Nvm works now, strange