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Operating Systems Linux Red Hat No process ID for listening ports Post 302360295 by Padow on Thursday 8th of October 2009 02:07:08 PM
Old 10-08-2009
No process ID for listening ports

How can I have ports that are listening without processes being associated with them?

Code:
root@ldv002 # netstat -ltnup
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:5600                0.0.0.0:*                   LISTEN      1949/esmd
tcp        0      0 0.0.0.0:6305                0.0.0.0:*                   LISTEN      3651/xinetd
tcp        0      0 127.0.0.1:199               0.0.0.0:*                   LISTEN      5408/snmpd
tcp        0      0 0.0.0.0:34540               0.0.0.0:*                   LISTEN      -
tcp        0      0 0.0.0.0:1006                0.0.0.0:*                   LISTEN      5488/rpc.statd
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      3087/portmap
tcp        0      0 0.0.0.0:21                  0.0.0.0:*                   LISTEN      3669/vsftpd
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      3694/sendmail: acce
tcp        0      0 :::22                       :::*                        LISTEN      3634/sshd
udp        0      0 0.0.0.0:514                 0.0.0.0:*                               3044/syslogd
udp        0      0 0.0.0.0:161                 0.0.0.0:*                               5408/snmpd
udp        0      0 0.0.0.0:49471               0.0.0.0:*                               5408/snmpd
udp        0      0 0.0.0.0:68                  0.0.0.0:*                               2892/dhclient
udp        0      0 0.0.0.0:59742               0.0.0.0:*                               -
udp        0      0 0.0.0.0:1000                0.0.0.0:*                               5488/rpc.statd
udp        0      0 0.0.0.0:1003                0.0.0.0:*                               5488/rpc.statd
udp        0      0 0.0.0.0:111                 0.0.0.0:*                               3087/portmap

I have also tried:
Code:
root@ldv002 # lsof -i tcp:5600
COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
esmd    1949 root    4u  IPv4 338848       TCP *:esmmanager (LISTEN)
[/root]
root@ldv002 # lsof -i tcp:34540
[/root]
root@ldv002 # lsof -i tcp:59742
[/root]

Padow
 

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SOCKSTAT(1)                                                 BSD General Commands Manual                                                SOCKSTAT(1)

NAME
sockstat -- list open sockets SYNOPSIS
sockstat [-clh] [-p ports] [-P pid|process] [-U uid|user] [-G gid|group] DESCRIPTION
The sockstat command lists open Internet or UNIX domain sockets. The following options are available: -c Show connected sockets. -l Show listening sockets. -h Show a usage summary. -p ports Only show Internet sockets if either the local or foreign port number is on the specified list. The ports argument is a comma- separated list of port numbers and ranges specified as first and last port separated by a dash. -P pid|process Only show sockets of the specified pid|process. The pid|process argument is a process name or pid. -U uid|user Only show sockets of the specified uid|user. The uid|user argument is a username or uid. -G gid|group Only show sockets of the specified gid|group. The gid|group argument is a groupname or gid. If neither -c or -l is specified, sockstat will list both listening and connected sockets. The information listed for each socket is: USER The user who owns the socket. COMMAND The command which holds the socket. PID The process ID of the command which holds the socket. FD The file descriptor number of the socket. PROTO The transport protocol associated with the socket for Internet sockets, or the type of socket (stream or datagram) for UNIX sockets. LOCAL ADDRESS For Internet sockets, this is the address the local end of the socket is bound to (see getsockname(2)). For bound UNIX sockets, it is the socket's filename. For other UNIX sockets, it is a right arrow followed by the endpoint's filename, or ``??'' if the endpoint could not be determined. FOREIGN ADDRESS (Internet sockets only) The address the foreign end of the socket is bound to (see getpeername(2)). SEE ALSO
netstat(1), protocols(5) HISTORY
The sockstat command appeared in FreeBSD 3.1. AUTHORS
The sockstat command and this manual page were written by Dag-Erling Smorgrav <des@FreeBSD.org>. The sockstat command was ported to Linux by William Pitcock <nenolod@nenolod.net>. BSD May 18, 2008 BSD
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