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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 Aug 21, 2012The download link for 1.3.1 dev version isn't working for me, I get canno't connect to the webpage. Anyone else having trouble?
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Posted Aug 21, 2012@MyPictures
The problems seem to be related to CNCP, if I remove that people can walk again
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Posted Aug 21, 2012@Davyhalliday
Same issue.
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Posted Aug 21, 2012Where can I find the latest dev's?
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Posted Aug 21, 2012@cyclo666
I have no idea whats wrong on your server. I, @asofold and @NeatMonster test every change that comes from @NeatMonster or @asofold and on the latest dev build we can walk, eat, fall, run, jump and much more without getting blocked or pulled back by NC+. Is it error really just gone when you disable NC+?
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Posted Aug 21, 2012@NeatMonster
Thank you so much!
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Posted Aug 21, 2012@Davyhalliday
Please state exact versions for CraftBukkit NCP and client otherwise it is useless to check, if possible update to latest versions first. If the problem persists, make a ticket.
(Are client and server on MC 1.3.2 ? CB+NCP not just the main number, please give build number as with the /version command and /version NoCheatPlus)
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Posted Aug 21, 2012Hunger is messed up. Drops quickly and players cant eat food or gen health due to instant eating and another instahealing check. Also, players randomly fall into the void all the time in chat, although they havent fallen or died.
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Posted Aug 21, 2012@lolitsthad Even if I doubt it's NoCheatPlus fault, you can try to set the following boolean in the configuration to false: checks.chat.nopwnage.relogin.active.
@cembry90 Weirdo... Honestly, I've no idea how NoCheatPlus could possibly block all commands.
@Melodicaxe Another weird issue, NoCheatPlus doesn't change the food level. It gets it, it doesn't change it.
@ryansworld10 Because of people complaining, I removed the workaround for this issue. I'll re-add it in build #38 based on what @epicbastion said.
@cyclo666 This is just crazy, I've only made minor changes in the last 5 developments versions.
@epicbastion Build #39 will be based on build #32 (I'll use the exact same workaround for the 'Moved too quickly' issue). Let's hope it'll will work as intended. Anyway, you can disable the fix in the configuration file.
(Changes between build #32 and #38.)
@jakerawk Update NoCheatPlus. ;)
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Posted Aug 21, 2012When I have nocheat enabled on my server people in the default group can't do /help command.
nothing i do in permissions fixes it. only disabling nocheat fixes it. any help?
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Posted Aug 21, 2012@NeatMonster
I have become some what confused, I am currently using dev build 32 which has the flymod fix in it, when i switched to 33 there was the falling out of world error, so i went back to 32, i have not had any complaints from players nor have i noticed any issues with build 32.
My question is between build 32 and the current dev build what has changed?
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Posted Aug 21, 2012@Melodicaxe
Yes, and drowning damage ticks way to fast.
EDIT: nvm, fixed with the latest dev
EDIT2: the latest dev fixes hunger but completely screws everything else, people can't even walk without being pulled back.I think I'll just use an older version and keep hunger disabled for now :)
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Posted Aug 21, 2012On build #38 I'm getting the "Moved too Quickly!" error. This is extremely annoying as I want certain players to be able to fly. Allow-flight is set to true, and I have all permissions.
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Posted Aug 21, 2012Hunger lvl drops really quickly for some reason
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Posted Aug 21, 2012Using NCP v3.7-b30, I have a strange bug ever since updating to 1.3.1-R1 (and also with 1.3.1-R2). Basically when NCP is in the plugins folder (we'll call this 'enabled' from here on out) and the server is loaded, I can use commands as normal. When I reload the server (/reload), both commands for every plugin and commands for Bukkit don't work. Again, this happens only when NCP is enabled (I've disabled it and the commands all work fine without it) and only on the second time it's loaded (when I disable it, put it back into the plugins folder, then do a /reload, it works but if I /reload a second time, it breaks as before).
Any words on this? Are you aware this happens?
Thanks. :-)
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Posted Aug 21, 2012@lolitsthad
Save this config, store it somewhere, and generate a new one. The new one has changed quite a bit.
Do not change anything in the new config (as a test) and let us know if this fixes it or not.
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Posted Aug 20, 2012@MasterGabeMOD
These are my settings: http://pastie.org/4559951 Mind taking a look?
I'm using the dev build of NoCheat+
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Posted Aug 20, 2012@lolitsthad
I have never heard of this happening 0.o
There's been no reports of this, so it's possible it could be a plugin, or your settings are jacked up.
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Posted Aug 20, 2012Since updating to 1.3 and installing the dev version of NoCheat+ I've gotten lots of reports of new users being automatically banned the first time they tried joining the server. I'm not sure if this is related to NoCheat+ or another plugin acting up, has anyone else had this issue?
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Posted Aug 20, 2012To everyone having trouble with movement checks, please update to build #38.
I removed the workaround for Bukkit blocking fly mods. Sounds like it was the source of all those problems. If you still have any issue, please leave another comment here.
I'm off to bed (3AM here), bye guys!
Edit: Just two little things. First, the "Livestream" button of all NoCheatPlus pages will turn to green if I'm livestreaming my coding on Twitch. Second, I added a message displayed to players having the notify permissions to alert them when a new update is available.