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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 Feb 24, 2013Getting this error on startup with Spigot Jenkins Build #571: http://pastebin.com/GEQCQjji
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Posted Feb 23, 2013So exactly what perm is passing the message "Flying not allowed by server" I set all the fly permissions that your "Permission" guid advised to that were there for allowing flight, but it still did not work, I had to remove your plugin to allow the voxel mod packs fly addon to actually work...
So tell me, what EXACTLY are the permissions I need to give to a particular group to allow them to fly.
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Posted Feb 23, 2013@your1i
The issue is caused by another plugin (most likely SpoutPlugin), but the workaround will possible with all future versions.
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Posted Feb 23, 2013@asofold
thats gonna be the last thing im gonna try for now then, results in a few mins EDIT: Nice, that did it! thanks a lot :D btw, are upsidedown halfslabs going to be supported in the next reccomended release of NC+?
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Posted Feb 23, 2013@your1i
For that setting to work you would have to use the latest development build (http://dev.bukkit.org/server-mods/nocheatplus/pages/nocheat-plus-development/jenkins/).
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Posted Feb 23, 2013@asofold
I Looked at it and added step: "ign_passable|ground|solid|height100" in, but this didnt solve it, im gonna try updating spoutplugin tomorrow, but its pretty late now and I kinda wanna go to sleep :P
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Posted Feb 23, 2013@your1i
SpoutPlugin?
This is the ticket with more info on this:
http://dev.bukkit.org/server-mods/nocheatplus/tickets/435-halfslabs-trigger-survivalfly-violations/
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Posted Feb 23, 2013players cant walk on upside-down halfslabs, they are reported for survivalfly
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Posted Feb 23, 2013@Reiby2012
Hast du OP oder bypass permissions? Benutzt du spout/spoutcraft und/oder CompatNoCheatPlus? Bist du in Freecam oder anderem? Auf welche CraftBukkit Version läuft du ?
Wir können dir garantieren das wir unsere builds testen bevor wir sie an die Öffentlichkeit promoten.
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Posted Feb 23, 2013@Reiby2012
Wie testest du?
Startup log?
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Posted Feb 23, 2013@asofold
ich habe b353 :( funktioniert trotzdem nix...
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Posted Feb 23, 2013@Reiby2012
Ok :) - dann schau nach einer Version für 1.4.7 (NoCheatPlus 3.8.9-b353):
http://dev.bukkit.org/server-mods/nocheatplus/files/
(Dev-builds: http://dev.bukkit.org/server-mods/nocheatplus/pages/nocheat-plus-development/jenkins/ )
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Posted Feb 23, 2013@asofold
bei mir auf 1.4.7R0.1 funktionier nix ! garnix! es blockt nichts! garnix!
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Posted Feb 23, 2013@Reiby2012
Was für ein Quatsch.
@lolitsthad
Does this happen in the presence of lag spikes, for clients with a lot of latency or always?
You might try the latest dev builds and if it still occurs, set checks.moving.velocity.graceticks to a higher value ( + 20 = 1 second more).
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Posted Feb 23, 2013Sorge mal dafür das dein Plugin auch funktioniert sonst kannst du es gleich löschen... Es funktioniert nicht also lösche es!
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Posted Feb 23, 2013@MyPictures
It's the survival fly check
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Posted Feb 23, 2013@MyPictures
thx, im gonna try it straight away, gonna post the results in a few mins Everything works now
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Posted Feb 23, 2013@your1i
The version of NoCheatPlus you currently use is not compatible with MC 1.4.7 and higher (only for 1.4.6 and lower). For Minecraft 1.4.7 you need NC 353 or higher: http://dev.bukkit.org/server-mods/nocheatplus/files/44-nocheat-plus-3-8-9-b353/
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Posted Feb 23, 2013@MyPictures
after some more testing, it appears i cant use any of the checks at all, its just like the plugin doesnt even exist... im getting the following error: http://pastebin.com/GjXHuidc im using the latest RCB build
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Posted Feb 23, 2013@EMTofficial
What version of CraftBukkit and NoCheatPlus are you currently running? I suggest to open a ticket for your issue. Setting vertical-accounting to false should fix this but will also allow more cheating with SurvivalFly and other.