[SOLVED] Help me open a port for my Minecraft server

Hai guise, I'm a noob, and I'm trying to set up a Minecraft server using Bukkit on my Debian computer. The port is 25565.

I used sudo iptables -A INPUT -p tcp --dport 25565 -j ACCEPT to open it. iptables -L gives

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

It seems like everything should work fine, but the server spits this out at me:

$ java -jar craftbukkit.jar 
174 recipes
27 achievements
23:01:44 [INFO] Starting minecraft server version 1.1
23:01:44 [INFO] Loading properties
23:01:44 [INFO] Starting Minecraft server on *:25565
23:01:50 [WARNING] **** FAILED TO BIND TO PORT!
23:01:50 [WARNING] The exception was: java.lang.NoSuchMethodError: method java.net.ServerSocket.setPerformancePreferences with signature (III)V was not found.
23:01:50 [WARNING] Perhaps a server is already running on that port?

I found this website http://minecraft.codeemo.com/access.php that checks if the port is working, and it says:

Port 22 appears to be open.
Port 80 seems to be closed.
Port 8080 seems to be closed.
Port 25565 seems to be closed.

What gives?

Originally Posted by Lumify Hai guise, I'm a noob, and I'm trying to set up a Minecraft server using Bukkit on my Debian computer. The port is 25565. I used sudo iptables -A INPUT -p tcp --dport 25565 -j ACCEPT to open it. iptables -L gives Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination It seems like everything should work fine, but the server spits this out at me: $ java -jar craftbukkit.jar 174 recipes 27 achievements 23:01:44 [INFO] Starting minecraft server version 1.1 23:01:44 [INFO] Loading properties 23:01:44 [INFO] Starting Minecraft server on *:25565 23:01:50 [WARNING] **** FAILED TO BIND TO PORT! 23:01:50 [WARNING] The exception was: java.lang.NoSuchMethodError: method java.net.ServerSocket.setPerformancePreferences with signature (III)V was not found. 23:01:50 [WARNING] Perhaps a server is already running on that port? I found this website http://minecraft.codeemo.com/access.php that checks if the port is working, and it says: Port 22 appears to be open. Port 80 seems to be closed. Port 8080 seems to be closed. Port 25565 seems to be closed. What gives?

I run a minecraft server myself on a ubuntu server (Based on debian) The error your getting "Failed to bind port" means that that port is in use for another application, if its a shared server edit your "server.properties" file with a different port...Otherwise you might have a zombie process roaming around keeping that port locked... restart the server and try again? XD


There are commands to find the program keeping that port open but off the top of my head i can't remember... and some one will post it below? \/

Here it is...


sudo netstat -anltp|grep :25565

Looks like this on my server.. When actually working mind you.. Notice that its running Java..

user@LoM:~$ sudo netstat -anltp|grep :25565
][sudo] 
[sudo] password for user:
tcp6       0      0 :::25565                :::*                    LISTEN      1962/java
tcp6       0    339 10.0.0.2:25565          174.51.241.93:50119     ESTABLISHED 1962/java
tcp6       0   4569 10.0.0.2:25565          110.32.151.228:18494    ESTABLISHED 1962/java
tcp6       0    385 10.0.0.2:25565          75.82.165.81:55030      ESTABLISHED 1962/java
tcp6       0      0 10.0.0.2:25565          58.166.84.42:63534      TIME_WAIT   -
tcp6       0   2817 10.0.0.2:25565          115.64.230.74:49934     ESTABLISHED 1962/java
tcp6       0    343 10.0.0.2:25565          121.217.45.155:1080     ESTABLISHED 1962/java

From:
http://ubuntuforums.org/showpost.php...09&postcount=2

Debian and Ubuntu are practically the same, so it's good to hear from another user. One problem is I cannot restart the server because I'm rsyncing two local drives, and every time I restart it transfers everything over again. (see this thread: http://www.linuxquestions.org/questi....php?p=4603827)

I tried changing the port to a random 25784, and I get the same issue. I've also tried forwarding the used port in my router. Here's the output of # netstat -anltp:

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:55403           0.0.0.0:*               LISTEN      -               
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      709/portmap     
tcp        0      0 0.0.0.0:49107           0.0.0.0:*               LISTEN      1022/rpc.mountd 
tcp        0      0 0.0.0.0:37011           0.0.0.0:*               LISTEN      722/rpc.statd   
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1609/sshd       
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      1235/cupsd      
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1498/exim4      
tcp        0      0 0.0.0.0:2049            0.0.0.0:*               LISTEN      -               
tcp        0      0 0.0.0.0:901             0.0.0.0:*               LISTEN      1577/inetd      
tcp        0      0 192.168.0.69:22         192.168.0.1:49010       ESTABLISHED 21880/sshd: server [p
tcp        0      0 192.168.0.69:47896      64.13.22.67:22          ESTABLISHED 27579/ssh       
tcp6       0      0 :::139                  :::*                    LISTEN      1592/smbd       
tcp6       0      0 :::80                   :::*                    LISTEN      1109/apache2    
tcp6       0      0 :::22                   :::*                    LISTEN      1609/sshd       
tcp6       0      0 ::1:631                 :::*                    LISTEN      1235/cupsd      
tcp6       0      0 ::1:25                  :::*                    LISTEN      1498/exim4      
tcp6       0      0 :::445                  :::*                    LISTEN      1592/smbd

This isn't a router \ firewall issue right now... first we must remove the "FAILED TO BIND PORT" issue since even if the router and firewall are setup correctly it'll still fail

ok the port isn't in use, look in your 'server.properties' file, perhaps your binding to your external ip address... make sure you have nothing in "server-ip=" unless your using multiple network interface cards XD

Also your config for your iptables shows accepting of all connections...so you don't need to open that up any further XD

server.properties:

#Minecraft server properties
#Thu Feb 02 02:49:30 EST 2012
allow-nether=false
level-name=world
enable-query=false
allow-flight=true
server-port=25565
level-type=DEFAULT
enable-rcon=false
level-seed=
server-ip=
spawn-npcs=true
white-list=false
spawn-animals=true
online-mode=true
pvp=true
difficulty=0
gamemode=0
max-players=20
spawn-monsters=true
generate-structures=true
view-distance=15
motd=Lumify's epic server.

Maybe I could open it up more if I posted my IP address and root password. :P

This could be as well a problem with java itself.
Make shure to have a java > 1.6
or, if more than one java is installed, use your "update-alternatives" to choose the proper one.

I dont know the name of "update-alternatives" on a debian box.
Albeit that I use Debian on some servers, I refuse to bother myself with java crap.
SCNR

If you managed to get the server running, make sure your router does proper port forwarding.

Originally Posted by uhelp Make shure to have a java > 1.6

YES!! That was it. I had 1.5, and updating to 1.6 fixed everything. Thanks both of you for the help.