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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 Jul 7, 2013@asofold
Also confirming with nocheat build 558, essentials Dev2.12.5 Bit odd as it doesn't occur every time when using /heal or /heal <name>. First time testing, got the error. Onwards, no error. Tried both when damaged and full hearts. OS - CentOS 6, Java 7 Update 25.
[WARNING] [NoCheatPlus] API incompatibility detected: com.earth2me.essentials.User.getHealth
[WARNING] [NoCheatPlus] API incompatibility detected: com.earth2me.essentials.User.getMaxHealth
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Posted Jul 6, 2013Does anyone know a plugin that blocks radar bro so they can't see certain items on the map?
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Posted Jul 6, 2013Not sure if you can, but if you're able to block this - http://www.youtube.com/watch?v=5KjfWqHeb8U
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Posted Jul 6, 2013@mrchasez
Yes, use build 558 (+). It will still print out the warning, but works around the issue. I will not disable it before knowing the exact reason.
My suspicion was one of:
Could not reproduce this issue with coding about the same as Essentials does with "/heal", compiled with 1.6/1.7 jdk, nothing like happens with Essentials on.
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Posted Jul 6, 2013@asofold
How can we use Nocheat with 1.6? I got this error after using /heal http://pastie.org/8116160
Updated to latest dev build: [WARNING] [NoCheatPlus] Health API incompatibility detected.
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Posted Jul 6, 2013@DeadIntermediate
@Mikkets
CraftBukkit does not even have a beta out yet, so you should keep an eye on plugins development builds as well, this time some API changed which might even render normal Bukkit-API plugins inoperable under dubious circumstances.
We do have development builds out for 1.6.1, we will update on BukkitDev soon.
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Posted Jul 6, 2013Update please
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Posted Jul 6, 2013Update to 1.6.1?
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Posted Jul 6, 2013@Shevchikden
Make them fake join. You can do that in the bukkit.yml or the mod specific configuration file. Your permissions plugin might recolonize it. Also give your players: nocheatplus.checks.blockplace.against.liquids and nocheatplus.checks.blockplace.against.air otherwise they wont be able to place IC2 cables or BuildCraft stuff.
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Posted Jul 5, 2013@asofold Permission plugins doesn't give them permissions beause those fakeplayers are not online.
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Posted Jul 5, 2013@Shevchikden
Those fake players have special names like "[BuildSomethingBot]", don't they ?
Did you try giving bypass permissions (nocheatplus.checks) ?
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Posted Jul 5, 2013Is there any way to ignore mcpc+ fakeplayers?
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Posted Jul 5, 2013@MyPictures
Well according to the 1.6.2 list, the problem lies there. The clear command. When typing, it comes in periods, that chat line is getting cleared to start of line, and you can start typing again, hoping it will not get cleared.
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Posted Jul 5, 2013Nodus is screwed :D
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Posted Jul 4, 2013@fungreenfox
"Getting stopped in typing"? What does that exactly mean? The second issue I don't understand also. Some creative inventory stuff will get fixed in 1.6.2: http://www.minecraftwiki.net/wiki/Upcoming_features
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Posted Jul 4, 2013@asofold
Yes i have set this to false now, but i am still getting stopped in typing, and the item list in creative is resetting before i can pick an item. Its REALLY annoying.
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Posted Jul 4, 2013@rtcabooservb
Ticket already exist here: http://dev.bukkit.org/bukkit-plugins/nocheatplus/tickets/582-heal-error/
Also whats your CraftBukkit and NoCheatPlus version? This error is because Minecraft changed the "health" system of entity's in 1.6.
@PikachiPC
@lishid is a friend of mine and he also exchanges information's with us if he finds something affecting NoCheatPlus. I also worked together with him to find and patch a security hole in CraftBukkit which used to "force update" obfuscated chunks.
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Posted Jul 3, 2013I think you should remove orebfuscator, The dev, lishid was on HF a few weeks ago discussing bypasses and releasing them.
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Posted Jul 3, 2013@fungreenfox
Build 554 allows disabling any motd sending.
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Posted Jul 3, 2013@MyPictures
ok, it has a purpose then. Can we please get a msg in this thread perhaps, when it can be replaced.