How can I know what is running on a TCP port

[Christophe MAILHE]

Hi everybody,

I have been trying to install XNTPD on one of my server, but the port 123 seems to be already in use by another application. When starting xntpd I got the following error message :

13 Sep 18:57:33 xntpd[1599]: bind() fd 10, family 2, port 123, addr 8264ffff, in_classd=0 flags=0 fails: Address already in use

Does someone can tell me how I could find which application is running on this port ?

Many thanks,

Chris.

[Stefan Farrelly]

lsof will show you what is using a TCP port. You can download from;

http://hpux.cs.utah.edu/hppd/hpux/Sysadmin/lsof-4.64/

Once installed you do;

lsof -i | grep

[Christophe MAILHE]

Cannot use lsof on this machine as this is a 64 bits and I can use cc on this production server.

Another idea, or if someone have the 64b version of lsof (HP-UX 11.00) ?

Many thanks,

Chris.

[Yogeeraj_1]

hi,

There should not be any problem.

Can you try the attached binary?

Hope this Helps!

Best Regards
Yogeeraj

[Bill McNAMARA_1]

have a look at /etc/services
It should be ntp...
perhaps try stopping and restarting it..

Later,
Bill

[Stefan Farrelly · Accepted solution]

Send me an email and I will reply with a 64bit version of lsof attached.

There have been tons of questions and replies about this lately but ive just checked most of them and they all point to lsof v4.64 - which is NOT a 64bit version (the .64 is just a subversion number).

Cheers,

Stefan
Stefan_Farrelly@ipcmedia.com

[Bill McNAMARA_1]

32 and 64 bit versions here:

ftp://vic.cc.purdue.edu/pub/tools/unix/lsof/binaries/hpux/B.11.00/vxfs/


Later,
Bill

[Christophe MAILHE]

I have found nothing for port 123 neither for address 8264ffff using lsof -i.

Another idea ?

Cheers,

Chris.

[Patrick Chim]

Hi,

I have seen this error before. It's due to the wrong configuration of ntpd environment.

Do you set your server to be a ntp server or a ntp client ?

Regards,
Patrick

[Stefan Farrelly]

I seem to recall one of 2 possibilities;

1. you need a later patch for ntp. You can check on itrc.hp.com under individual patches for ntp patches (do a search).

2. Even after you start xntpd (/sbin/init.d/xntpd start) have you checked the ntp daemon didnt start even though it produced an error ? (ps -ef|grep ntp) Does this command work; ntpq -p

[Christophe MAILHE]

Hi Patrick,

This server is a client.

Here is the ntp.conf file for this machine :

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

server 127.127.1.1 # local clock
fudge 127.127.1.1 stratum 3 # Allow local Synchro.
broadcastclient no # Not a Broadcast Client
driftfile /var/adm/syslog/ntp.drift # Drift File
statsdir /var/tmp/ntp/ # Statistics Directory
statistics loopstats # Enable Stats
statistics peerstats # Enable Stats
filegen loopstats file loopstat type week enable # 1 week stat only
filegen peerstats file loopstat type week enable # 1 week stat only
filegen clockstats file clockstats type week enable # 1 week stat only
server pita.housing21.co.uk version 3 # Internal Stratum 2 Server
peer titan.housing21.co.uk version 3 # Internal Stratum 3 Peer


@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

Many thanks,

Chris.

[Steven Sim Kok Leong]

Hi,

Have you checked udp as well?

# lsof -i udp:123

Hope this helps. Regards.

Steven Sim Kok Leong