How to check if a particular port assigned is listening

[san ch]

Hi

iam working in solaris and configured my messaging server to port 82 ,i want to know how to check if this port is listening .......i tried
netstat -anp |grep 82
it jus gave me prompt again didnt understand
any help would be great
thank you in advance
san

[Lewin Chan]

Are you running your messaging server as root, attempts to listen on a port < 1024 on Unix like systems is restricted to root only.

On solaris, I would probably check all the listening processes using

netstat -a | grep LISTEN

as netstat doesn't work in quite the same way as on Linux.

You'll get output like

      *.5987               *.*                0      0 24576      0 LISTEN
      *.38669              *.*                0      0 24576      0 LISTEN
      *.80                 *.*                0      0 24576      0 LISTEN

So you know there's something listening on port 80, 5987, 38669 (etc etc).

[Ulf Dittmer]

Try to telnet into port 82. If the connection is refused, there's nothing listening on that port.

[Tim Holloway]

On Linux grepping for the port number can fail if the port has an entry in /etc/services, such as "http". Thus you want to either search by service name or force numeric port display.

I believe that "netstat -ln" will do it for you.

[Stefan Wagner]

I'm used to use

 
nmap HOSTNAME

to check ports, and (as root)

lsof -Pni

[san ch]

Hi

Thank you for your response,iam working as root ,i will try these things.
i ahve tried

 netstat -anp |grep 82
 

and iam getting the prompt normally ,does this mean the port is listening???the telent to the port looks like a good idea will see if i can do that thank you soo much
san ch

[Stefan Wagner]

No, that means 'not listening'
Grep filters lines (from the output, if used in a pipe) and displays only matching lines.
A better command would be:

 netstat -anp | grep ":82 "

[san ch]

Thank you for your help it is working

san ch