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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 Sep 13, 2012The fast break check is so unreliable, i've had to disable it altogether.
Players were getting violations for using efficiency pickaxes on blocks such as dirt, gravel and sand. Using shears on leaves also seemed to trigger it and axes on various wood types.
Using build 87, default config and the server is running at 20tps.
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Posted Sep 13, 2012@asofold
All who used the latest versions of cncp (insta break hook) should immediately update to cncp 6.2.2.
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Posted Sep 13, 2012@H8llfire
Who somebody ? Reliable testers or many users or one of 100 users? Need more details to judge ... also is the server very laggy (tps)?
It is possible to adjust nofall a little at the cost of accuracy, but it depoends on what situations lead to nofall damage and: do they get more damage than normal ?
@kahlilnc
Spout, Disguisecraft ?
It might be Spout causing issues, but also do update cncp.
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Posted Sep 13, 2012@asofold
I think it is 84 I'm on right now. Same issue as always. Getting nofall messages when somebody falls.
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Posted Sep 13, 2012@H8llfire
NoFall should be pretty fine, which build are you using ?
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Posted Sep 13, 2012So when will the NoFall alerts be fixed? Or are they already?
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Posted Sep 13, 2012@kahlilnc
@cyclo666
Ok, if possible, please pm me a plugin list, and also configuration of cncp and ncp. Plus versions.
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Posted Sep 13, 2012@cyclo666
Im getting the same thing :(
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Posted Sep 13, 2012@cyclo666
I could not reproduce, also the latest beta seems blocked.
But i had another user saying that cncp 6.2.1 would allow people to fly, just not on my computer. So probably that is a case for sending a plugin list..
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Posted Sep 13, 2012@asofold
If I remove CNCP completely flying is blocked again and Nocheat starts spamming the console with survivalfly warnings. I haven't modified the confiigs for both plugins in any way, I have even deleted the configs so they could re generate.
It was just nodus 9.7, no special settings
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Posted Sep 13, 2012@cyclo666
Nodus (MC1.3.1) still seems blocked both with and without CompatNoCheatPlus with and without set-speed hook both on 2361 and 2365.
Have you been using a newer version or special settings with nodus ? And have you been using the nomovedtooquickly setting ? (We currently recommend not to use that, anyway.)
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Posted Sep 13, 2012@cyclo666
Can you please send me or asofold the client over PN? We can not reproduce this and we also cant find any "new" Nodus version on the official website of them.
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Posted Sep 13, 2012People are able to fly unrestricted with the latest Nodus versions.
NoCheatPlus #87 with a new generated and untouched config. Bukkit #2365
Edit: Just installed anticheat on my test server and flying is blocked again with that
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Posted Sep 12, 2012I could help you find a 100% free service from some sponsor's
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Posted Sep 12, 2012@asofold
Left you some messages on irc regarding the recent block lag/invisible block issues. 100% confirmed nocheatplus
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Posted Sep 12, 2012@LordKainzo
nocheatplus.checks.chat
nocheatplus.checks.chat.nopwnage
nocheatplus.checks.chat.globalchat
You might consider nocheatplus.checks.chat.nopwnage.captcha - but with that they would just not do the captcha but the other actions get executed. If you have a ban configured in nopwnage, then this is worse than captcha. If you have nopwnage actions just do cancel chat, then it would probably be an option.
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Posted Sep 12, 2012I re-read the main post but didn't see it.
What's the permissions to give a group the ability to bypass the chat spam/filter ?
I'd like to give my "whitelisted" members the ability to not get hit by the captcha but still have my greylisted players get hit by it :)
Thanks!
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Posted Sep 12, 2012@MarioG1
Please write all your infos about this bug here:
http://dev.bukkit.org/server-mods/nocheatplus/tickets/208-build-84-fastbreak-issues/
You would help us a lot with that ;)
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Posted Sep 12, 2012@MickeeYman1
I will give it a day or two to upload to bukkitdev, unless i meet NeatMonster earlier and we decide for something else.
Currently you can check the Dev pinboard change list to estimate the stability of a build, download here:
http://www.nocheatplus.org:8080/job/NoCheatPlus/
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Posted Sep 12, 2012taking a while to update to 1.3.1, i guess you guys are working hard to make it epic!
thanks!