Question

I lunched a simulator program which developed on C++ in my Ubuntu 11 when i want kill this process from process list of Linux and want to run it again, i faced to this error:

Error initializing sockets: port=6000. Address already in use

I used lsof command to find PID of process:

saman@jack:~$ lsof -i:6000
COMMAND    PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
rcssserve 8764 saman    3u  IPv4  81762      0t0  UDP *:x11

after that i tried to kill PID of 8764. but still it has error.
How can i fix it?

Answer 1

I think the problem you are having is that the socket if it is not shutdown correctly then it is still reserved and waiting for a timeout to be closed by the kernel.

Try doing a netstat -nutap and see if there’s a line like this:

tcp        0      0 AAA.AAA.AAA.AAA:6000     XXX.XXX.XXX.XXX:YYYY       TIME_WAIT   -

if that’s the case you just have to wait until the kernel drops it (30 secs approx) until you can open the socket at 6000 without conflict