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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 Mar 26, 2013I'm using a plugin to disable join/leave messages but when ncp kicks them they will still show the join/leave message. Is there anyway to disable this through your plugin?
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Posted Mar 26, 2013@theone_123
Please give us some time to keep up, I will try to reproduce and report back on your ticket you just made.
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Posted Mar 26, 2013The recent version of NoCheatPlus on this page disables crop trampling for me. If i disable this plugin, crop trampling is working again. I think this is a new not listed bug!
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Posted Mar 26, 2013@TheAtreidius
Whats your Craftbukkit, Essentials and NC+ version? I also use Essentials (The PreRelease) and everything works fine for me (just Passable but that is a bug in MC). Any other plugin involved maybe? It would be better if you would make a ticket so we can keep track of your issue.
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Posted Mar 26, 2013@MyPictures
Ok thank you.
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Posted Mar 26, 2013I was seeing similar errors related to survivalfly. It was happening when players would use the Essentials plugin's /warp command.
Not sure if this is a bug or not, but it would be great if NCP could somehow detect when players are legitimately teleporting.
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Posted Mar 26, 2013@mclightcraftproduction
A ForceOP doesn't exist so no need to protect against it. Be sure you have a save password to access the console, HTTPS would be wonderful. Also don't install any bad software on your computer that could steal your passwords. And set your server to online-mode=true to prevent players logging in with accounts that they don't own.
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Posted Mar 26, 2013Does NocheatPlus protect players from force op?
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Posted Mar 26, 2013@Apple_columb
You can turn it off (several ways: selectively, global).
If your mods don't want to check anyway.
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Posted Mar 26, 2013This is how my regular "chat" looks like with default setup and 100 players:
Server is not laging. (20/20 TPS, network is not overloaded). They are not hacking. And I can't tell what's wrong with it due to lack of useful information provided by default NCP in-game. It's just useless spam. Pretty annoying. Every my moderator hates NCP because of this :(
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Posted Mar 26, 2013@JustinFatalx
What is the violations messages shown ingame or in the logs? Do they show something about hover?
@Unknown_Mage
Randomly on login or teleports? Those are normal at present, since the Minecraft client sends moving (falling) packets without having loaded the chunk. I will at some point add an option to silently cancel after longer range telelports and login, but better would be a working fix on side of Minecraft.
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Posted Mar 25, 20132013-03-25 22:13:42 [INFO] [NoCheatPlus] Player failed Passable: moved into a block (24). V 580.
Been getting this error randomly with any user. No matter the permissions.
R: NoCheatPlus 3.9.0-RC-b488 for 1.5.1 Mar 21, 2013
CraftBukkit Build #2716: 1.5.1-R0.1
Apparently, it makes my players act as if they are using NoClip when they aren't.
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Posted Mar 25, 2013I have the default config and we use Xauth and when people try to login while on a ladder or a lilypad or a vine it kicks them for flying.
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Posted Mar 25, 2013@anthill1
Silmpy, Just update your World Edit.
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Posted Mar 25, 2013@anthill1
That's WorldEdit for sure. Try to update it and if you have issues then better ask the WorldEdit team to help you (On the IRC they are pretty active).
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Posted Mar 25, 2013@anthill1
Not NCP - do you have WorldEdit and is it up to date ?
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Posted Mar 24, 2013My console gets spammed with this..
24.03 18:57:07 [Server] WARNING No compatible nms block class found. 24.03 18:57:07 [Server] WARNING No compatible nms block class found. 24.03 18:57:07 [Server] WARNING No compatible nms block class found. 24.03 18:57:07 [Server] WARNING No compatible nms block class found. 24.03 18:57:06 [Server] WARNING No compatible nms block class found. 24.03 18:57:06 [Server] WARNING No compatible nms block class found. 24.03 18:57:06 [Server] WARNING No compatible nms block class found. 24.03 18:57:06 [Server] WARNING No compatible nms block class found. 24.03 18:57:06 [Server] WARNING No compatible nms block class found. 24.03 18:57:05 [Server] WARNING No compatible nms block class found. 24.03 18:57:05 [Server] WARNING No compatible nms block class found. 24.03 18:57:04 [Server] WARNING No compatible nms block class found.
Can anyone help me?
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Posted Mar 24, 2013@AShyHyena
No changes on it has been made. What changed for you? Version of CB and NC+?
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Posted Mar 24, 2013Did you take away the only op from console thing?
Because it changed.
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Posted Mar 24, 2013@waremanu
@MyPictures
The hover check might now and then have a false positive which i could not yet track down. By default it is set to add 500 to the violation level, which might be a bit much, it can be set lower, resulting in a longer time before reaching 1000.
The question is if any false positives can add up to 700 too quickly. Usually you have false positives like 50-150 for jumping onto block edges or pistons and in most cases they don't keep adding. On certain piston setups those might escalate, though. Also if there is a shape-incompatibility, due to mods or whatever, then violations might get higher if players try to walk over something that ncp does not recognize as ground.
From a smaller server i only remember higher violations from hover (fishy, might be false positives standing on edges of stairs or half slabs), or from people that just logged in and then log out swiftly after getting set back.