topic check open port in Operating System - HP-UX

check open port

Mohd Azahari — Sun, 21 Feb 2010 20:51:39 GMT

Hi,

I'm trying to change my current listener port no to something else but when I started the listener, there is no service registered after 1 minute.

I need to find out how to determine if this port is blocked.

trying telnet host_ip portno gets connection refused.

thanx for helping

Re: check open port

Steven Schweda — Sun, 21 Feb 2010 22:01:12 GMT

Should I know what "the listener" is? Or how
you started it?

> [...] there is no service registered after
> 1 minute.

And you determined this how, exactly?

> I need to find out how to determine if this
> port is blocked.

Who would be blocking it? How much network
lies between you and "host_ip"?

> [...] connection refused.

That normally means that no one is listening
at that port.

Re: check open port

Kapil Jha — Mon, 22 Feb 2010 01:47:36 GMT

is there nay firewall in between ?
have u added the port in /etc/services

Port would only listen when service is running, are you sure ur application is accepting new port.

BR,
Kapil+

Re: check open port

Fandi Kurnia — Mon, 22 Feb 2010 12:03:51 GMT

check all port use this :

#vi /etc/services

for flush your firewall :

#ipf -Fa

or you can check using :

#netstat -an | grep [port number]

Re: check open port

Horia Chirculescu — Mon, 22 Feb 2010 12:13:51 GMT

Hello,

>I'm trying to change my current listener port no to something else but when I started the listener, there is no service registered after 1 minute.

You should investigate what is the reason why your daemon dies. Check your daemon's log (if any) and check the syslog file.

Some daemons exit when have nothing to do and must be re-started when needed.

Horia.

Re: check open port

WayneHP — Mon, 22 Feb 2010 13:46:09 GMT

Can you send the output of, /etc/hosts file , ,netstat -in command , hostname command, lsnrctl start (as oracle admin)command, and your listener.ora file.

Re: check open port

Wilfred Chau_1 — Mon, 22 Feb 2010 17:55:25 GMT

Which port number did you try to change to?

You cannot change to a port no < 1024 as a non root user, i.e. oracle.

Re: check open port

Abbott Vascular — Mon, 22 Feb 2010 20:35:07 GMT

you might also want to use a tool call 'lsof' - this might be you're best bet, but answer the guys questions above and we can get more detailed.

-RCP