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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 16, 2013@LordKainzo
The latest builds of NoCheatPlus have a couple of things changed according velocity handling and other. For now you could config around with this setting here (under SurvivalFly):
Hooking in the NC+ API and exempting the player would also be a possibility: http://dev.bukkit.org/server-mods/nocheatplus/pages/documentation/api/
However, the "new" velocity handling needs still more testing but from what I tested now it seems that it reduced some old false positives we had with SurvivalFly.
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Posted Feb 16, 2013@Asofold The latest NocheatPlus (as of Feb 15th) is causing issues with one of our skills it didnt previously.
The current build downloaded in DBO worked just fine.
Skill jump pushes the player forward with great velocity. Allowing them to clear distances etc.
13.02.16 19:31:21 [INFO] DefaultTexture failed SurvivalFly: tried to move unexpectedly. VL 3.
It triggers that ... is there a way to put this back the other way?
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Posted Feb 16, 2013@MartinTheHamster
We write back on the ticket you just made.
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Posted Feb 16, 2013Could you add Notifications? Could you add a notification when someone reaches a violation level? :D
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Posted Feb 16, 2013Oh, already fixed it! you need to update it.
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Posted Feb 16, 2013I get this error? 19:54:53 [INFO] [NoCheatPlus] Enabling NoCheatPlus v3.8.4-RC-b271 19:54:53 [SEVERE] Error occurred while enabling NoCheatPlus v3.8.4-RC-b271 (Is i t 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(SimplePluginManage r.java:381) at org.bukkit.craftbukkit.v1_4_R1.CraftServer.loadPlugin(CraftServer.jav a:282) at org.bukkit.craftbukkit.v1_4_R1.CraftServer.enablePlugins(CraftServer. java:264) at net.minecraft.server.v1_4_R1.MinecraftServer.j(MinecraftServer.java:3 21) at net.minecraft.server.v1_4_R1.MinecraftServer.e(MinecraftServer.java:3 00) at net.minecraft.server.v1_4_R1.MinecraftServer.a(MinecraftServer.java:2 59) at net.minecraft.server.v1_4_R1.DedicatedServer.init(DedicatedServer.jav a:149) at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java :399) at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:8 49) 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 16, 2013@DarkRiddles
You should update NoCheatPlus:
http://dev.bukkit.org/server-mods/nocheatplus/files/
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Posted Feb 16, 2013Hey I get a error when I start up my server!
04:00:32 [INFO] [NoCheatPlus] Enabling NoCheatPlus v3.8.4-RC-b271 04:00:32 [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 15, 2013@cuddyier
Cool. That was fast :)
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Posted Feb 15, 2013@MyPictures
Just updated my spigot to the recommended build and updated nocheatplus to the recommended build and it's all fine :D Lava/water block placing works! Thanks.
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Posted Feb 15, 2013@cuddyier
NC+ only prevents breaking water/lava blocks in creative mode and placing other blocks on top of water/lava blocks (cheating...). The permissions for this are: nocheatplus.checks.blockbreak.break.fluid and nocheatplus.checks.blockplace.against.liquids
Please be sure your CraftBukkit server is up to date. I recommend to at least use CraftBukkit 1.4.7-R1.0 together with NC+ 353 for now. If you want more support then please provide more info's to us (such as CB and NC+ versions) and feel free to open up a new ticket for us.
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Posted Feb 15, 2013How do I stop nocheatplus from blocking players placing lava/water blocks? It definitely is nocheatplus causing this issue for me, no doubt in my mind. I'm using build #387
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Posted Feb 15, 2013@amitkilo
Us the latest development build from our Jenkins (you need to regenerate your configuration.yml to make it work), it will at least "fix" the NoSwing notification spam. If its really annoying you can also disable NoSwing completely.
@alexandercitt I'm not sure @alexandercit. Your download points to the valid NC+ version but your server loads a outdated version of NoCheatPlus. I will recommend to re-download all plugins and install them one by one. Do you use a modified CraftBukkit server or anything like that?
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Posted Feb 15, 2013@amitkilo
Known issue. You might just change the actions to "cancel" only or turn that check off if it is a problem.
@alexandercitt
Somewhere in your server directory is a NoCheatplus jar (it might be named differently by accident).
Check your plugins folders, the server directory and maybe lib folder in the server directory for jars that you don't know of what they are there for.
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Posted Feb 15, 2013@MyPictures
Still getting the same error... :\
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Posted Feb 15, 2013i found a bug, when you break mushrooms\saplings\tall grass and etc with gamemode 2 in a protected arena, it's think you are using noswing
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Posted Feb 14, 2013@alexandercitt
Not sure but your server is loading up the wrong NoCheatPlus version:
2013-02-12 18:32:02 [SEVERE] Error occurred while enabling NoCheatPlus v3.8.7-b292 (Is it up to date?)Its loading up version 292 instead of 353... You stop the server then replace the NC+ jar and then start it up again right? If you update it with /reload its not going to work.
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Posted Feb 14, 2013@asofold
@MyPictures
There is only 1 NoCheatPlus.jar file in the plugins folder and I'm running: -http://dl.bukkit.org/downloads/craftbukkit/view/01845_1.4.7-R1.0/ -http://dev.bukkit.org/server-mods/nocheatplus/files/44-nocheat-plus-3-8-9-b353/
But still, this error:
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Posted Feb 14, 2013@lANTHONYl
If you can give any more information then please do :) with "More info....." I meant that I will keep you updated on the ticket if I find something new for your issue. Currently I have difficulty's reproducing it, hmm...
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Posted Feb 14, 2013@MyPictures "More info's I post on the ticket you made."
I'm sorry, i don't understand. Are you asking me for more information?