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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 May 11, 2013@JustinFatalx
Thanks. Follow @asofolds advice and it should be fixed in no time :)
@x_clucky
If the grassy field is protected and the players can't break blocks around there then you may get NoSwing VLs. If you have this problem then please regenerate your configuration file by simple deleting it from your NoCheatPlus folder and doing /ncp reload or restarting the whole server. @asofold changed the actions a long time ago which prevents this from happening.
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Posted May 11, 2013@JustinFatalx
"NoCheatPlus (1).jar" looks very much like you have 2 different versions of NoCheatPlus under different names on your plugins folder (or some other library folder of your server).
Make sure there is only one!
@x_clucky
That could be.
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Posted May 10, 2013@MyPictures
Think it could have been caused when two players were fighting in a grassy field?
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Posted May 10, 2013@MyPictures
You're right it does not seem to be loading on server startup. Here is the error.
http://pastebin.com/Qk2mYnkJ
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Posted May 10, 2013@JustinFatalx
Can you give us a server.log please? Maybe NC+ fails to startup.
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Posted May 10, 2013@MyPictures
Ok this is really weird. I never noticed that before and I have NoCheatPlus 3.9.1-RC2-b510 added to my server and even just restarted my server and its still not working for some reason.
Do I need to delete the config or something due to a recent update?
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Posted May 10, 2013@NemesisMate
Ticket 51
@JustinFatalx
You simple do not have NoCheatPlus installed on your server, I only see CompatNoCheatPlus when I do /pl or try to get it over /version. If you want compatibility with mcmmo you need CompatNoCheatPlus and NoCheatPlus otherwise CompatNoCheatPlus will be useless. CNCP will only communicate with NC+ and mcmmo (and some other plugins) to make them compatible with each other. Simple "reinstall" NC+ by using the download button or getting the latest development version from our "Jenkins". Thanks for your time and I hope you can fix it. However I couldn't reproduce any fly weakness with that client you just linked to.
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Posted May 10, 2013Forcefield of nodus is working on last builds.
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Posted May 10, 2013@asofold
Yes was able to fly high as I wanted.
If you want you can try out the hack I sent you on my server. Be warned tho someone might ban you :D
Server info in my signature.
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Posted May 10, 2013@MegaFlary
Could reproduce your issue and its fixed in NC+ 511 and higher. You can download that build from our Jenkins.
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Posted May 10, 2013I cant break Block of Gold with stone pickaxe.
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Posted May 10, 2013@x_clucky
Emm there are 3 NoSwing checks in NoCheatPlus. One is for BlockBreak the other is for BlockPlace and the last one is for Fight.
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Posted May 9, 2013@x_clucky
Truly reloads - i would be surprised :).
The AutoSign check should prevent some of that editing, i will look into compatibility later, for the moment just disable the check if you are using a sign editor.
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Posted May 9, 2013@asofold
"this" is NCP reports, but no other alerts... none at all... Just NoSwing :/ I can't get it to replicate now though, I think the config only truly reloads after a restart, /ncp reload didn't seem to do anything... Unless my syntax was wrong...
However, another thing. I am using the plugin SignEdit to edit signs, however, whenever I try to use the plugin I get the following NCP hack report:
Could you please take a look into fixing it?
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Posted May 9, 2013@x_clucky
We get notifications when people add to tickets :).
Please be more specific about "this"... what alerts do you get? The noswing check is just one check, if people are attacking too fast other checks will alert too, like fight.speed or combined.improbably, depends on what they are actually doing.
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Posted May 9, 2013I replied to the ticket http://dev.bukkit.org/server-mods/nocheatplus/tickets/528-false-survival-fly-check-leads-to-death-by-fall-damage/#comments
Also, I have having a slight issue...
As you can see, I made cif into cf and this is still spamming my staff in game when a player is punching too fast. They are not hacking either, and it is really really bad spam.
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Posted May 9, 2013@JustinFatalx
Could you fly up higher than you could jump? Were there any check alerts (passable, ...)?
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Posted May 9, 2013It was both and he was able to fly up and down also because I just tested this hack myself on a normal account. Here is the link to the hack.
I was able to use fly and speed hack and yes I made sure I did not have permissions to ignore NC+.
http://www.mpgh.net/forum/335-minecraft-hacks/662694-minecraft-1-5-2-hacked-client-rubix.html
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Posted May 9, 2013@JustinFatalx
So was it a fly or speed hack now? Did he go of air or did he just sprint really fast?
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Posted May 9, 2013I am also using the latest version of this plugin and on 1.5.2 and had a player that was flying and speed hacking and my config is default and I do not allow this type of behaviour.
Also when he was flying he did not go up or down it was just straight foward.