abnormal timeouts

[zmyle]

am using hp9000,UX 11i platform for the datacentre.however the guys on the windows end using oracle complain about unexpected quick timeout(5-8 min) while trying to establishe telnet,sql,.. connections.guys, your suggetions wil highly appreciated

[Torsten.]

8min to establish telnet is a quick timeout?

Anyway, it's a job for your network team, I guess.

[RAC_1]

Please give more details. How do they connect? Using telnet/ssh/through apps? How?
OR are you telling that once, they connect, they timeout? If this is the case, check two things.-TMOUT variable setting and firewall if there is one.

[Torsten.]

The following commands should give you an initial idea what is going wrong:

windows to unix:

- ping and pathping
- tracert
- nslookup

unix to windows:

- ping
- traceroute
- nslookup

[zmyle]

thanks for the response so far,
first of all, the connection is through cisco pix 525 firewall, 3600 series routers, hp procurve switches to the application servers.
although connections are mostly through telnet, the problem also escalates to the sql connections and pending transactions
as for the termination, it occurs after (5-8)mins after connection has been established

[zmyle]

thanks torsten,
however i tried that(commands suggested) out and all was fine

[RAC_1]

The most probable reason is firewall. Check with firewall admin.

[Sยภเl Kย๓คг]

Hi,

Was this setup working earlier without any troubles, if what was the last change done on this setup;

If you have any other HPUX boxes within your datacenter, which can directly communicate to your server( Not through firewall). Try telnet or ssh from those boxes.

And also you can try opening a telent or ssh within your server and see.

Regards,
Sunil

[zmyle]

firewall, please a little eraboration will help.otherwise can this be caused by network segmentation?

[Bill Hassell]

It's possible that they are seeing DNS problems. To eliminate DNS issues, edit the /etc/nsswitch.conf file to use files, then dns for resolution. Then put your production server names+IP into /etc/hosts. If the delays go away, you have DNS configuration issues in the DNS servers.

[rick jones]

Sory to be pendantic, but timeouts while trying to _establish_ the telnet etc connection? Or timeouts _after_ the connections are established?

And when you say established, do you mean just at the TCP level, or do you mean until first response from the server application? (Eg login prompt in telnet or whatever sql does).

[zmyle]

the timeouts are actually after the connecton has been set.only tcp telnet.

[rick jones]

So, delays _after_ TCP connections have been estalished. That does imply as others have suggested a possible issue with DNS resolution.