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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 Apr 23, 2012feature request: limit the number of players logged in from the same IP.
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Posted Apr 23, 2012@Pr07o7yp3
Turn off the captcha if you want to ban normal players for spam.
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Posted Apr 23, 2012NeatMonster, I know that it replaced with NoPwnage. But I don't want nopwnage protection. I need from old Spam protection becouse I used it for kick players if they send more than 3 messages in 3 sec.
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Posted Apr 23, 2012@portcoquitlam Haha, thanks!
@Pr07o7yp3 It has been replaced by the integration of NoPwnage. Please read the Instructions.txt.
@deleted_7554077 Yeah, this check will be removed in the next version.
@hispanicdude Hum... If you're running an offline-mode server, I can't do anything for you. Otherwise, NoCheat+ has an option to allow OP management only for the console.
@jakimfett Thanks!
@qwerty00011 Change the settings (and read the Instructions.txt).
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Posted Apr 23, 2012Can you make it so it just blocks the glitches, not kicks them for it? People are getting mad for being kicked for "flying" when they obviosly aren't.
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Posted Apr 23, 2012I am loving this plugin, thank you so much for picking this up and moving forward. This now does the work of three of my cheating/hacking protection plugins...if you included the functionality of CurseBan, this would be the only plugin I need...
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Posted Apr 23, 2012I'm in love with this plugin, would love also if it had protection against session stealing.
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Posted Apr 23, 2012@andrewkm
Hey - CB now detects proxies from what I'm aware of.
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Posted Apr 23, 2012The Unpushable still is a bit buggy. I use Tele 2 for my admins and when they teleport to people they get stuck in the players when running thru people is fixed.
I disabled the unpushable until it gets bit better :D
Just letting you know.
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Posted Apr 23, 2012Btw, where is the spam protection?
Why have you removed it?
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Posted Apr 22, 2012Thank God That Someone Re Made NoCheat
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Posted Apr 22, 2012@guyag
The version comment was'nt meant to you...
in any case: deactivating the unpushable check should be tried if you experience lag with NoCheatPlus right now.
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Posted Apr 22, 2012@guyag
sorry, this appears to have been an ftp problem!
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Posted Apr 22, 2012@guyag
The plugin is called NoCheatPlus, so that's the name of the plugin folder. If that's not there, verify that the plugin was actually loaded in the first place.
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Posted Apr 22, 2012@asofold
Not sure what you mean by that. I'm running version 3.5.8.
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Posted Apr 22, 2012I just installed NC+ 3.5.8, started the server back up but there is no NoCheat directory. Where does the config file go??
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Posted Apr 22, 2012@MutinyCraft Are you sure your player hasn't the permission allowing him to use this mod?
@darksora269 You were probably OP or had the permissions required to fly. Almost all my testings are done using Nodus.
@asofold Feel free to post ideas, "pseudo-codes" or pull requests. :)
@np98765 What can I reply to this comment? <3
@rtcabooservb @badda2k @Kirdog @guyag OK guys, I've heard you. I'll try to optimize it.
@andrewkm I don't think so. The proxy detection feature was removed a long time ago by Evenprime.
@bluehasia I'm pretty this issue isn't related to NoCheat+.
@gl0ryz Thanks! :)
@plumblum Instructions.txt line 484 and line 326.
@asofold @Kirdog @asofold @Kirdog @asofold I think I'll remove this check, it's too glitchy. If you want extra-details about this check, please read my previous comment.
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Posted Apr 22, 2012@Kirdog
Then one can not be sure that it is caused by that check for your server :) ...
but having the latest version of NoCheatPlus should be good, if your CraftBukkit version is supported by it.
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Posted Apr 22, 2012@asofold Thanks. I had old version and this version didn't have this flag. :)
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Posted Apr 22, 2012@Kirdog
There should be a section in the NoCheatPlus configuration: