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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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 May 23, 2014@asofold
If done with a large enough radius, it will lag the whole server.
@Shevchikden
This.
@asofold
I am fully aware of the player magnet glitch. When Ice and I were testing it, it didn't create any messages of players moving wrongly.
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Posted May 23, 2014@asofold
This exploit is based on sending PacketPlayerInPosition to move across the map while in vehicle. While it does not move the player for real it still triggers playermoveevent and loads chunks if factions is present.
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Posted May 23, 2014@xiTzJardix
@ProdigyOG
Is there many such messages? Do all players lag or just the players nearby?
There is also other packet spamming exploits out there, e.g. with the result of fast healing and nearby players freezing.
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Posted May 22, 2014@xiTzJardix
The player may be causing many chunks to be rendered. Probably being done by being inside a vehicle and changing the player's position all over the map, causing chunks to be constantly loaded. This would make the server and and player's fps lag. (This exploit was made public a while ago... https://www.youtube.com/watch?v=AryqbB6ThJM#t=100)
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Posted May 22, 2014I have someone on my survival server who let all the minecraft clients lagg and world lagg
He does that with some weird movement you see in console Player1274 moved wrongly
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Posted May 22, 2014A quick note - thank you - to all the devs involved with ncp+!
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Posted May 19, 2014@ProMiner909
This is fixed in Build 700 (you can get it from Jenkins)
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Posted May 19, 2014@plchevellepl
Lag but also latency can influence checks a good bit. In case of angle the check could trigger with lots of lag + latency when fast clicking.
@ProMiner909
A release is pending approval that adds an exception list, which contains "flint and steel" by default.
@marubal21
Do those glitches work with NCP installed? Are they teleported back when moving?
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Posted May 19, 2014@MyPictures
Sorry i should have been more clear and offered an actual explanation. Currently in MC there are glitches at allow players to reach above the roof of the Nether, aside from those glitches we use essentials and with the correct setup a player could set up a home warp in the nether that would port them to the top of the roof. I was asking if this plugin could prevent players from doing that, or just in general check to make sure a player is not above the roof.
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Posted May 19, 2014@ProMiner909
Nm i read the red top part
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Posted May 19, 2014This is breaking my nether portals for normal players so they can not light them
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Posted May 19, 2014Is it possible that the value of fight.angle can affect server lags? Recently their level considerably increased on this server.
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Posted May 19, 2014@plchevellepl
@MyPictures
With Minecraft i would at least schedule one restart per day, but mainly for other reasons.
The current VL history implementation is not really fit for such high uptimes, because it does not contain any timing information.
Did they ban on base of actual complaints or on base of "random history checking"?
It's possible to set NCP to periodically erase offline player history, however a problem can always be not being able to judge if a player got most violations within short time or over hours of intense playing.
We are well aware that some server owners would love to have auto-banning, but i am afraid it's hardly possible - because "smart" cheat clients are much adapted to NCP, you will usually only catch the "dumb clients", but those "dumb clients" get prevented for most anyway, so i rate the damage of banning on base of incomplete information higher than not banning an actual cheater. At least server owners should establish some minimal procedure, e.g. some three-times-evidence:
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Posted May 19, 2014@plchevellepl
For 50 hours everything except the Angle and Improbable checks are pretty good. Which NoCheatPlus version did you use and did you change the config file of NC+ too?
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Posted May 18, 2014The last server restart was two weeks ago. I played mostly in the evenings. I'm not sure, but I suppose that I spent on the server about fifty hours. A lot of time I spent on the building. I can say that I killed exactly 4256 players, but I don't know how many mobs I killed, but far less. My admin sent me this: http://screenshooter.net/1181291/tpmumtw Can someone send me the same thing, but belonging to a real cheater? I would compare them.
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Posted May 18, 2014@marubal21
Reaching the top of the nether? By teleporting? No we do not have such check bust mostly a teleport/portalplugin can cause this problem too. Or did you mean they mine up there? Because the last top layer on the nether is badrock.
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Posted May 18, 2014I looked but i couldn't find it, but does this plugin have a feature to prevent players from reaching the roof of the nether?
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Posted May 18, 2014@asofold
They're not cheating, it's part of one of the games so I didn't want to remove it. I'll turn off the fastheal check
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Posted May 18, 2014@plchevellepl
You see the discussion below? It's about that very data. I would not recommend banning in general. The data is slightly suspicous, but in my opinion banning without further evidence is too much, also because one needs to know how long it took to collect those violations.
What fighting did you do since last server restart (how many minutes, vs. players, vs.mobs, arenas)?
@Gr0up115
Why do they heal quickly? It's the fastheal check that is monitoring fast healing, it can be turned off,. I can't tell if it is it false positives or cheating or a plugin incompatibility...
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Posted May 18, 2014When players play MobArena on my server and heal quickly I get checks come up in chat. It flood my chat all the time so is there a way I can disable the check or disable it telling me about the player?
([Player] failed FastHeal. Regenerates health faster than usual.)