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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 Mar 3, 2013@TheNoobLol
What does not work? Be sure the version of NCP you downloaded matches your server version.
Update here:
Bukkit staff approved: http://dev.bukkit.org/server-mods/nocheatplus/files/
Or development builds: http://dev.bukkit.org/server-mods/nocheatplus/pages/nocheat-plus-development/jenkins/ ("mostly stable" is the marker for release phase, upload coming soon.)
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Posted Mar 3, 2013Dosnt work.
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Posted Mar 2, 2013@dotapurex1
Development builds:
http://dev.bukkit.org/server-mods/nocheatplus/pages/nocheat-plus-development/jenkins/
Keep to "mostly stable" if in doubt. Another release on BukkitDev will be coming soon.
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Posted Mar 2, 2013@asofold
When was it blocked?
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Posted Mar 2, 2013@dotapurex1
Update to latest development build of NoCheatPlus (Jenkins).
@Lightning97
Okay. Looks like your problem needs more research. Could you please open up a new ticket for us? Its easier to keep track of your issue then and it also wont get lost under the comments.
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Posted Mar 2, 2013@dotapurex1
Blocked :) - but in the development builds, release coming soon.
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Posted Mar 2, 2013Nodus users can Vclip! Please block?
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Posted Mar 2, 2013@MyPictures
I have neither of those plugins and my permissions are set correctly.
@Asofold I see, Alright. Thank you.
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Posted Mar 2, 2013@Lightning97
Alright. Hack clients tend to explicitly adapt to our default settings. So they will attempt to stay just below the thresholds.
If you think they are placing blocks too fast, you can alter the settings (i recommend lowering the normal limit and keeping the shortterm one).
What we might add would be more long-term tracking with extra thresholds, so people can go at high rate for seconds but not for many seconds.
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Posted Mar 2, 2013@Lightning97
I can not reproduce your issues with CraftBukkit 2634 and NoCheatPlus 428. Do you have plugins such as SpoutCraft or CompatNoCheatPlus installed? Your Permissions are also set right?
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Posted Mar 2, 2013@asofold
When using the command /ncp version
I get this
"
-- Version Information--Servergit-Bukkit-1.4.7-R1.0-b2624jnks (MC:1.4.7)NoCheat PlusPlugin: 3.8.10-b428 MCAcess: 1.4.7 / CB2602 "What I mean by fast place and everything else I listed working, I mean that people cause use these nodus features with little to no effort. NCP doesn't seem to be blocking them what so ever, and the only hacks it is preventing is stuff such as Nuker. At this point it's becoming quite frequent that I'm having to IP ban a lot of people for taking advantage of this.
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Posted Mar 2, 2013@Lightning97
Sorry i misread. So what does "/ncp version" output? Any errors in the logs?
What do you mean by "fastplace etc. works"? Do they actually bypass anything or do they just activate some client-side feature that then does something ?
You can still downgrade to 418 ("mostly stable"), unless you really need anything recently changed/added.
The latest file on BukkitDev is the alpha version (3.8.9-b353 ), it does not work with 1.4.7-R1.0?
I am constantly misreading: So build 428 works, but build 353 does not work? Difficult today :) ...
482 should be pretty good, i am just waiting for new bugs, basically it is very close to release.
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Posted Mar 2, 2013@asofold
Using Craftbukkit 1.4.7-R1.0 - Your latest file here on Bukkit doesn't work with it.
So the NCP Version I'm using for my server at the moment is the lastest Dev Build, #482
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Posted Mar 2, 2013@Lightning97
Why use a recommended build? Does it match your server version?
Update here:
Bukkit staff approved: http://dev.bukkit.org/server-mods/nocheatplus/files/
Or development builds: http://dev.bukkit.org/server-mods/nocheatplus/pages/nocheat-plus-development/jenkins/ ("mostly stable" is the marker for release phase, upload coming soon.)
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Posted Mar 2, 2013Using the latest Recommended bukkit build and latest build for NCP and Had people with nodus use it and some things such as Fast Break, Fly, Highjump, fast place, Wallhack and a few others are still working. What on earth?
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Posted Mar 2, 2013@asofold
Sorry, meant step as you said.
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Posted Mar 1, 2013@mikeyriver
Your version of NCP might be outdated, update here:
Bukkit staff approved: http://dev.bukkit.org/server-mods/nocheatplus/files/
Or development builds: http://dev.bukkit.org/server-mods/nocheatplus/pages/nocheat-plus-development/jenkins/ ("mostly stable" is the marker for release phase, upload coming soon.)
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Posted Mar 1, 2013i own 2 servers and the plugin won't work for either servers. It loads the plugin with an error with it appears green in the /plugin list, meaning its working but it isnt
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Posted Mar 1, 2013@asofold
Thanks So Much! I can see my chat!
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Posted Mar 1, 2013@SXRWahrheit
Please upgrade to the "mostly stable" build (b418) in that case. It might already have fixed that.
If you use Spout plugin, check this:
http://dev.bukkit.org/server-mods/nocheatplus/tickets/435-halfslabs-trigger-survivalfly-violations/
@Lightning97
You can turn off all ingame alerts with setting logging.ingamechat to false in the configuration.
Otherwise you have to use permissions for that (negate nocheatplus.admin.notify).