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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 26, 2013Please help. All of my users are complaining that they are not allowed to sprint. I have an event-pvp server, and they can't sprint without getting tele'd back to where they started... I know that they aren't cheating because when I tested it, I couldn't sprint either.
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Posted Feb 26, 2013@noxturno
What is the water-thing? Can you describe what the problem is?
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Posted Feb 26, 2013@asofold
well the water thing happens even tho they get hit by mobs and stuff i think is because of lag not sure i am usint the latest from the jenkings and latest from spigot.
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Posted Feb 26, 2013@plasticraft
Please be sure you use 353 or higher for MC 1.4.7: http://dev.bukkit.org/server-mods/nocheatplus/files/44-nocheat-plus-3-8-9-b353/
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Posted Feb 26, 2013Hi, i have a problem. The plugin work, when i make /pl he is in green, i can make /nocheatplus ,... But, he don't block the fly ,... Help me please! And when i make /nocheatplus info , i have new a message with : Make : /nocheatplus info or /nocheatplus reload ... Please help me :')
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Posted Feb 26, 2013@Humanfiend
You can always help @asofold out making NC+ more compatible with other plugins here: http://dev.bukkit.org/server-mods/compatnocheatplus-cncp/
Maybe he can do something against those false positives for you and the other users of S86.
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Posted Feb 26, 2013@asofold
Pmed you with a crash issue were having.
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Posted Feb 26, 2013@asofold
Eeh, long story short: The server I had for a while was force shutdown and someone opened another identical to keep the community going. They've got about 40-50 plugins working but its "S86 powers" that errors with Nocheat and crashes (it happened before). Used to: S86 powers temporailary bypassed nocheat but since that code was removed...but this isnt Nocheats problem, its the powers. No need to tack more work for you, you're doing gods work anyway. Much respect: Human
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Posted Feb 26, 2013@Humanfiend
A public server would be prone to become somewhat unplayable for legit players.
Just have a look at the feature list of anti hack plugins... all those things will be possible. Heavily striking will be flying, unbeatable players in pvp and mob fights, xray (need another plugin for that anyway), arbitrary wreckage with fast placing/nuking of blocks. Also lagging the server will be easier with massive spamming items, chat, commands.
What plugin conflicts and how?
Edit: NCP allows extensive configuration, if it is just some features conflicting they might be adjusted or turned off. Further there might be something more possible with CompatNoCheatPlus.
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Posted Feb 26, 2013Mostly just curious, having troubles with a plugin conflicting with Nocheat. So my question is: What are the dangers of runign a server without Nocheat?
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Posted Feb 26, 2013@noxturno
For some things you might need a future version of CRaftBukkit/Minecraft, since they need to fix/improve some stuff.
Concerning NCP we do have false positives (see post below), but we have to judge which of those problems are actually caused by NCP and if so by what checks.
So which version of NCP are you running? Do you have more details about getting hit on water? Such is not a known issue...
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Posted Feb 26, 2013what settings do I need to change on the config to prevent people from been hit while on water to be pulled back to where they were before been hit? also I had an issue with people running of a block or jumping of the blocks were they get pulled back.
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Posted Feb 25, 2013@SXRWahrheit
Need more details...
of course there still are false positives, the question is how often/which. One basic problem with Minecraft is, that the client does not always send the move from air to ground, thus we have to guess those for the case of continuous jumping more often than good, still causing false positives. Pistons still pose a problem, as well.
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Posted Feb 25, 2013Using #403 players who I'm fairly certain aren't using modified clients keep setting off stuff like SurvivalFly. Any idea how I can make this better?
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Posted Feb 24, 2013@RashoodKrisb
You did not use the latest version.
On BukkitDev every project has a files page, you can always check there if a file has been marked to be compatible with your server version:
http://dev.bukkit.org/server-mods/nocheatplus/files/
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Posted Feb 24, 2013I get this error on the startup... (using CB 1.4.7-R1.0 & latest NCP)
[SEVERE] Error occurred while enabling NoCheatPlus v3.8.4-RC-b271 (Is it up to date?) java.lang.NoClassDefFoundError: net/minecraft/server/IBlockAccess at fr.neatmonster.nocheatplus.NoCheatPlus.onEnable(NoCheatPlus.java:407) at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217) at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457) at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381) at org.bukkit.craftbukkit.v1_4_R1.CraftServer.loadPlugin(CraftServer.java:282) at org.bukkit.craftbukkit.v1_4_R1.CraftServer.enablePlugins(CraftServer.java:264) at net.minecraft.server.v1_4_R1.MinecraftServer.j(MinecraftServer.java:321) at net.minecraft.server.v1_4_R1.MinecraftServer.e(MinecraftServer.java:300) at net.minecraft.server.v1_4_R1.MinecraftServer.a(MinecraftServer.java:259) at net.minecraft.server.v1_4_R1.DedicatedServer.init(DedicatedServer.java:149) at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:399) at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849) Caused by: java.lang.ClassNotFoundException: net.minecraft.server.IBlockAccess at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70) at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 12 more
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Posted Feb 24, 2013@Mohammadtr
@AndreasB86
On BukkitDev every project has a files page, you can always check there if a file has been marked to be compatible with your server version:
http://dev.bukkit.org/server-mods/nocheatplus/files/
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Posted Feb 24, 2013This thing must be broken.. Whatever I write I just get the help text..
I have nocheaplus.admin.*
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Posted Feb 24, 2013I keep getting an error every time on startup
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Posted Feb 24, 2013@Rpgminecraft
NC+ has by default no message that kicks with "Flying is not allowed on the server", thats the inbuilt CraftBukkit/Minecraft fly check. You can disable that in the server.properties by setting allow-flight to true.
@Nickbbeezy
Hmm seems to work fine for me with Spigot 571 and NC+ 404:
[INFO] [NoCheatPlus] Enabling NoCheatPlus v3.8.10-ALPHA-b404
[INFO] [NoCheatPlus] McAccess set to: 1.4.7 / CB-DEV(2602+)
[INFO] [NoCheatPlus] Version 3.8.10-ALPHA-b404 is enabled.
Do you have anything special installed that might cause some issues? Like spout or MCPC+?