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Telnet port 5555

HP-UX_Ali
Regular Advisor

Telnet port 5555

Dear All,

telnet to port 5555 is getting hang in server.
checked with netstat and displaying CLOSE_WAIT.

issue: Backup server (DP) not able to import the client on hpux server B.11.23 and telnet to hpux-server not getting succcessfull.
checked with N/W admin too , port is opened and not blocked.

Kindly advice..
11 REPLIES
Steven E. Protter
Exalted Contributor

Re: Telnet port 5555

Shalom,

netstat -an | grep 5555

See if there is a process listening on port 5555.

More than likely it is not a telnet server process. The only thing telnet is good for in this case is to determine if a process is listening, which apparently is the case. That is done, as far as what the process is and why its not working, start with lsof and find out what kind of a listener we are talking about here.

SEP
Steven E Protter
Owner of ISN Corporation
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Alex Glennie
Honored Contributor

Re: Telnet port 5555

What happens if you use the ip-address as opposed to hostname in the above telnet command ?

Has the client been a member of any other cell in the past ?

What o/s is the client ?

Try adding the client manually by editting the cell_info file ?

Same subnet ?
Aneesh Mohan
Honored Contributor

Re: Telnet port 5555

>>telnet to port 5555 is getting hang in server.

Verify that port 5555 is not used by any other service than Datprotector.

You can check the service bind to the port using lsof command.


Regards,
AM
Aneesh Mohan
Honored Contributor

Re: Telnet port 5555

addendum...

If you are sure about only Dataprotector service is enabled with port 5555 then you may need to restart inetd daemon.


Regards,
AM
HP-UX_Ali
Regular Advisor

Re: Telnet port 5555

Hi Steven,

Telnet to port 5555 is listening in client (hpux-11iv2).
we have disabled telnet service in /etc/inetd.conf file as per security team long back. backup was going fine all these days. since two days backup is failing with inactivity time out error and when trying telnet from other servers or cmd the telnet session is hanging for port 5555 (checked with netstat -an|grep 5555) showing CLOSE_WAIT. But the port 5555 is listening in client side.

Kindly advice

Thanks to confirm...
HP-UX_Ali
Regular Advisor

Re: Telnet port 5555

dear alex
>What happens if you use the ip-address as opposed to hostname in the above telnet command ?
Same issue.
>Has the client been a member of any other cell in the past ?
No
What o/s is the client ?
hp-ux11iv2
>Try adding the client manually by editting the cell_info file ?
Checked but didnt work
Same subnet ?
yes

Pls advice any more area to check...

Thanks to confirm.
Johnson Punniyalingam
Honored Contributor

Re: Telnet port 5555

>>>since two days backup is failing with inactivity time out error and when trying telnet from other servers or cmd the telnet session is hanging for port 5555<<<


is the backup client server cpu,mem, usage is Ok ..? or do you have any bottle neck ..?

if you find (cpu & mem) high usage also may cause client go (inactivity time out error)
schedule a downtime & try to reboot the server
Problems are common to all, but attitude makes the difference
Frank de Vries
Respected Contributor

Re: Telnet port 5555

Port 5555
that is Dataprotector
[root@orasrv1:]/root<>>> grep 555 /etc/services
omni 5555/tcp # DATA-PROTECTOR
[root@orasrv1:]/root<>>>

Yes that is typical that it hangs.

If you have no backups running stop Omniback DP /sbin/init.d/omni.sh stop
and then on the client host see if all processes have gone, if not help them (ie kill).

Check your omni logs. You may have had an ipc error. If they are persistent best log a call with HP and get the latest patches.


Look before you leap
HP-UX_Ali
Regular Advisor

Re: Telnet port 5555

Hi All,

Being a production server we dont want to reboot. but where is issue?
logged a call with HP and as per them there is no issue found in server side and has to open the case with DP.. Since all backups are running fine for other servers with telnet disabled.

As per security team we have disabled telnet in /etc/inet.conf. when we enable and checked , client is imported successfully and backup is happening.
when we disable telnet in /etc/inetd.conf and try to telnet on port 5555 is getting hang.

Kindly advice, if any one can help in this ..

Thanks & regards
Steven Schweda
Honored Contributor

Re: Telnet port 5555

> As per security team we have disabled
> telnet in /etc/inet.conf.

How, exactly?

> when we enable and checked , client is
> imported successfully and backup is
> happening.

When you enabled _what_, exactly, how,
exactly?

> when we disable telnet in /etc/inetd.conf
> [...]

How, exactly?

> [...] and try to telnet on port 5555 is
> getting hang.

Enabling or disabling the normal Telnet
service in /etc/inetd.conf should have no
effect of what happens when you use a Telnet
client to try to talk to some non-Telnet
port, like, say, port 5555.

Why are you trying to use Telnet to talk to
port 5555 on some server? What, exactly, are
you trying to do, and why?
HP-UX_Ali
Regular Advisor

Re: Telnet port 5555

Dear All

I have fixed the issue, killed the process for (port 5555) and restarted the inetd service by inetd -l


Know the telnet is not hanging for port 5555 and able to import the client from backup servers.

Thanks all of you for you inputs & advices.

Hence closing thread.

regards
Ali