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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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).
Comments
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_ForgeUser9668734 Owner
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_ForgeUser15078623 Ticket Manager
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_ForgeUser16101223 Contributor
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_ForgeUser7091862 Former Author
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_ForgeUser7459264 Former Author
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Forge_User_61842651 Author
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MyPicturesCP Artist
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Posted Dec 16, 2012using spigot
12:40:19 [SEVERE] Error occurred while disabling NoCheatPlus v3.8.4-RC-b271 (Is it up to date?)
java.lang.NullPointerException
at fr.neatmonster.nocheatplus.NoCheatPlus.onDisable(NoCheatPlus.java:349)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:219)
at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:400)
at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:400)
at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:393)
at org.bukkit.craftbukkit.CraftServer.disablePlugins(CraftServer.java:295)
at net.minecraft.server.MinecraftServer.stop(MinecraftServer.java:350)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:458)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
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Posted Dec 16, 2012@Jeruhmi
Downgrade CraftBukkit to 2511 or below and use a stable release of NCP (build 274 or 271). Or which one did you update to?
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Posted Dec 16, 2012Love this plugin, but in the last update or two it has started lagging the absolute hell out of my server. Hopefully that can be resolved :) Thanks.
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Posted Dec 15, 2012@TheFamousFlyingDutchman
Known bug, unfortunately it was only fixed in the otherwise buggy versions for CB2512+, so i will have to fix other issues first.
@noxturno
Wild clicking is currently being punished, fix might be coming relatively soon, unfortunately i have problems with the project structure making it all inefficient to update .
Better not use CB2512+ and the NCP beta versions, the beta versions are buggy currently. So i recommend downgrading CraftBukkit below CB2511 (incl.) and Using a stable version of NoCheatPlus (build 274 or 271).
@FurmigaHumana
Thanks, updated the link.
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Posted Dec 15, 2012@asofold
the links to hook pages isn't working, just saying. https://github.com/NoCheatPlus/NoCheatPlus/tree/master/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/hooks
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Posted Dec 15, 2012also i notice people been able to go thru walls not sure what client they are using but nocheat alerts me on the warnings.
any ideas how they are doing this? and why nocheat is not blocking them?
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Posted Dec 15, 2012hey got a quick question what settings do I need to change so nocheat leave people using mobgrinders kill the mobs? I notice after they kill maybe 5 they cant hurt the rest of the mobs in their mob grinder
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Posted Dec 15, 2012Thanks for an awesome plugin. It seems to run fine however when I do a reload I get the following error (Running CB 1.4.5-R0.2-b2488):
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Posted Dec 15, 2012@Luzitano
Alright. Did you have a protection plugin before? What checks do alert most (nocheatplus.log)?
Without versions of CraftBukkit and NCP and plugins it will be hard to tell if it is "normal" for NCP. What kind of CPU is that?
If you run Citizens or certain skill-related plugins for instance, there will be a lot violations in the background causing a lot of overhead, if not using compatibility tweaks.
@Zeokon
(Or the latest beta release CB 1.4.5-R0.2 with NCP-b274.)
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Posted Dec 15, 2012@asofold
Alright thanks =D
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Posted Dec 15, 2012@Zeokon
CB2511 + NCP-b274 should work fine.
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Posted Dec 15, 2012@asofold
how about the latest dev build without the NMS changes, would it still work with build #274?
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Posted Dec 15, 2012@asofold
Well m8 when i say this plugin burns my Cpu is something like this. Im Owner of a small server. 30 slots 3gb Ram and "only" 30 plugins - when i have like 25 ppl online im sufocated with messages - and on my VPS console the cpu always goes on 100% I removed plugin and everything fine :X
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Posted Dec 15, 2012@Zeokon
It should be possible, but it might contain a range of bugs (i could confirm jumping on upside down stairs, which is a real problem, but it might have rendered some checks inoperable).
Below CB251 (incl.) better use: http://www.nocheatplus.org:8080/job/NoCheatPlus/274/ or b271.
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Posted Dec 14, 2012@asofold
is it possible to use this : http://www.nocheatplus.org:8080/job/NoCheatPlus/277/fr.neatmonster$nocheatplus/ for builds under 2511?
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Posted Dec 14, 2012@PhanaticD
Yes. I would be careful with banning, though. Some checks might have false positives in some cases, one should test the limits a little (with a hack client where necessary), or at least allow people disputing bans in general.
Better use a stable release (or build 274 from Jenkins) with CB2511 or earlier, due to the builds for CB2512+ being buggy.
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Posted Dec 14, 2012I can use plugins like ultrabans for the ban/kick system right?
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Posted Dec 14, 2012@sundriedmailbox The NCP builds for after CB2512 (or equivalent containing the NMS-breaking change) contain bugs, if possible use a server version without that change (CB2511 or before or another server-mod without the NMS-breaking change) with stable NCP build (274 or before)
Otherwise you might have the impression that they don't look at the blocks, if they turn to and fro quick enough one might not see it (as it was with adaptive nukers already).
Or you are right and they bypassed direction checks, but as long as wrongblock, fastbreak and frequency work, nukers are useless, direction does not matter that much.
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Posted Dec 14, 2012You can destroy blocks without looking at them currently (the check flat out does not work). This means that some clients have bypassed nukers.
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Posted Dec 14, 2012@asofold
I'm using the build that is currently up on this page.