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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 Oct 29, 2012@craftovski
That was with Survival Fly: Disabled now its all good.
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Posted Oct 29, 2012It says zombe's fly mod is not allowed on this server but when player activates it he can fly with space and shift like in creative, ive tried latest dev build(for 1.4) and latest stable (for 1.3.2) on craftbukkit 1.4.
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Posted Oct 29, 2012@VenomousPVP
Be sure you are running the latest NC+ with the latest CNCP, if you still get errors then make a ticket please (NC+ or CNCP page).
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Posted Oct 29, 2012@ziga808
I'm sure he is trying his best, so the best thing we can do is just standby, wait and offer our best support. Also we have to keep in mind this is not a simple plugin to develop, this type of plugin is not a development for the faint hearted hence why there is only two mainstream Anti-Hack plugins.
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Posted Oct 29, 2012I seem to be having my console spammed with this error [NoCheatPlus] Hook PlayerClass(cncp) [2.0] encountered an unexpected exception:
Although it is functioning properly in-game it seems to be doing this every-time someone either hacks or is subject to a NCP glitch. Does anyone have any Ideas on how to fix this or should I just wait until the recommended build of this and 1.4.2 comes out?
Thanks
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Posted Oct 29, 2012@ziga808
There is a 1.4 note on this page (red letters pretty much on top). Get a development build here: http://www.nocheatplus.org:8080/job/NoCheatPlus/
@jellymann
Thx :) - though ... who would know ? :p
It feels like people expect releases while CraftBukkit does not even have a beta build. Though that might take a while - two days after CB dev builds being up, i will not yet release it on BukkitDev. There could be any sort of bugs in CB by now.
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Posted Oct 29, 2012@ziga808
What do you think he's trying to do? Jack off? Give the developer some space man...
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Posted Oct 29, 2012asofod please update to version 1.4.2-R0.1
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Posted Oct 28, 2012@deathhzone
Sorry but "the latest" does not help us too much to narrow down stuff, always specify the exact version, for 1.4.2 ou need development builds found here:
http://www.nocheatplus.org:8080/job/NoCheatPlus/
@MapleFighter777
Please follow me: update cncp and create a ticket specifying used versions if problems persist.
@1.4.2
Please create tickets for real problems we don't have a slave that reads through all pages and keeps everything in memory, neither can we guess all the missing information to judge your topic. There might be several people trying to judge / reproduce / help. With continuing to post one detail after the other on this page people can not keep track of your issue.
Just to add: We do not plan to build on "slaves".
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Posted Oct 28, 2012Now I am getting this error spammed to my console using NCP for Bukkit 1.4.2 http://pastebin.com/59AqwDNu
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Posted Oct 28, 2012@asofold
No i dont use spot
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Posted Oct 28, 2012I think it also has errors about the new blocks and stuff
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Posted Oct 28, 2012My console is spammed with Survival Fly errors on CraftBukkit 1.4.2 and my users can barely move and I've updated to newest NCP and cncp and I've regened the configs. Please help.
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Posted Oct 28, 2012@mrchasez
I am sure, "more than 15 times per second" is an old message.
Are you sure you are running 3.7.9-RC-b191 ?
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Posted Oct 28, 2012@asofold
I let a new one generate today though ;/ Ill do it again, sigh.
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Posted Oct 28, 2012@mrchasez You are using an old configuration with that version, better let it regenerate (delete + /ncp reload for instance).
Why should that be false positives? If you think so please open a ticket and fill in informations like the exact versions used for NCP, CB, if used cncp and if you are using any skill-plugins for fighting.
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Posted Oct 28, 2012Using V3.7.9 These false positives come up a lot: [NoCheatPlus] DoctorDark tried to hit multiple entities at the same time. [NoCheatPlus] DoctorDark tried to do a knockback but wasn't technically sprinting. [NoCheatPlus] DoctorDark tried to hit more then 15 times a second
(Not just by that one user)
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Posted Oct 28, 2012@MapleFighter777
Please create a ticket, the comments section is not appropriate for keeping track of an issue.
Make sure you update cncp and please state all used versions (cncp, ncp, cb). Do create a ticket - several people might look at it or try to reproduce, this comments section does not help bundling the information for an issue.
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Posted Oct 28, 2012@asofold
I forgot to add, I have CB 1.4.2 v0.1 installed on the server.
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Posted Oct 28, 2012@MapleFighter777
DO update cncp if using MC 1.3.2, rest see below (please create a ticket).
@ShadowKillerx
@rolecraft
(....)
Please make a ticket and specify more information as asked there: http://dev.bukkit.org/server-mods/nocheatplus/create-ticket/
@jogoodman
Should not be related to NCP usually but please create a ticket if unsure, so we can bundle information there.
@Curtis4321
Spout? Please create a ticket, we will probably not be able to follow too many too long conversations on this page, naturally...