Remotely connecting to HP-UX poses a lot of problems

[Kishore.R.P]

1)MY HP-UX11iv2 machine is on a specific subnet as in rrr.rr.199.( its a rp3410 blade server).It has 2 hard disks one of them has HP-UX11iv2 and the other hard disk is not being used
2)ip of the hp-ux machine is rrr.rr.199.rrr
3)i need to access this hp-ux machine remotely from a windows machine on the same subnet,as in from a windows machine that has an IP address set to rrr.rr.199.***
4)I use putty or xmanager to connect to the Hp-UX machine remotely.
5)The issue i am facing is , the hp-ux machine comes into the network and goes out of network randomly as in i can connect to the hp-ux machine remotely once from windows, but the network connection gets disconnected after 2-3 minutes.I have a lot of Non windows machines(RHEL,Solaris) in the network, they do not give me this problem.
If i try to re-connect it says connection refused.
any help would be greatly appreciated

Thank you

[Jeeshan]

check your network cables, connected ports, LAN card.

also check the netconf files and also routing tables.

[sreekanthtm]

Hi,

I think the problem is with your windows system's network. Try to do a continuous ping from windows to the HPUX system. Hope there will be intermittent request timed out.

Rgds
Sreekanth

[TTr]

> the hp-ux machine comes into the network and goes out of network randomly

Login to the HP-UX machine vi the console or iLO and do a continuous ping out to a known stable network device. If you notice an interruption in the ping, check your hardware and cabling for link lights etc. At the same time check the HP-UX LAN status using ifconfig and lanadmin.

On another thought is it possible another machine is using the same IP as the HP-UX machine?

[Sherif A. Louis]

check the lan speed set on the network card. change it to autonegotiate.
i'd advice u to reset your newtork switches as well.

[Steven Schweda]

> If i try to re-connect it says connection
> refused.

"Connection refused" normally means that you
can talk to the remote system, but that the
program which should be handing the
connection request has gone missing, somehow.

If you're really seeing "connection refused",
I'd be looking more at the software than at
the network hardware. (Although I can
imagine a case where a network problem might
confuse a server program thoroughly enough to
keep it from answering the next connection
request, I've never seen that happen.)

> 4)I use putty or xmanager to connect to the
> Hp-UX machine remotely.

Connect how, exactly? SSH? Telnet? X?

Any evidence collecting in the log files?

[CharlesC]

Might you have a firewall between the HP and Windows machines? Might be a channel timeout or something like that?

[Kishore.R.P]

Thanks to all for the replies..
Windows network may not be a problem since we have as many as 200 machines which are stable.
Problem is appearing only when we connect to hp-ux, solaris and Linux do not provide a problem.

>>check the lan speed set on the network card. change it to autonegotiate

how do i accomplish the above.sorry to ask this, i am a QA guy and am not completely aware of sys admin internals of hp-ux.


> 4)I use putty or xmanager to connect to the
> Hp-UX machine remotely.

>>Connect how, exactly? SSH? Telnet? X?
It is SSH.

There is no firewall on windows machine

[CharlesC]

If there is no firewall between the machines, it would really sound like the lower layer of the connection is having problem.

The physical connection is not up to standard or bad contact. This may cause the LAN to negotiate with the LAN switch for the right LAN speed again. This can be solved by setting a dedicate LAN speed on either the server or the switch.

The command should be similar to the following:

lanadmin -X 100FD 1

where 1 is the NMID you get from lanscan for that particular LAN card. Do a man on the lanadmin.

[Sherif A. Louis]

Kishore, did you try to telnet the server?

[Asif Sharif]

Check the network status by following command.

#netfmt /var/adm/nettl.LOG000
If its showing message below then there would be your network problem.

1000Base-T in path 0/1/2/0
Detected a faulty or disconnected cable.

Regards,
Asif Sharif

[Steven Schweda]

> It is SSH.

Ok. And are you getting literal "connection
refused" complaints, or some other, similar
message? And does anything else (say, "ping"
or Telnet) still work when this happens? (As
I said, "connection refused" normally has
nothing to do with a network problem.) If
you can get into the system somehow, you
should be able to see if the SSH server is
running using a command like:
ps -ef | grep [s]shd
You should get something like this, for
example:

td192> ps -ef | grep [s]shd
root 695 1 0 Apr 21 ? 0:00 /opt/ssh/sbin/sshd

> [...] i am a QA guy and am not completely
> aware of sys admin internals of hp-ux.

Life can be so educational. You may need to
examine the system log files for clues, too.
(/var/adm/syslog/syslog.log, for example.)
The fun may be just beginning.

[Kishore.R.P]

Thanks a lot guys for all the responses...
I telneted to the iLO/Management port and cleared up the lan registers.
Its working somehow, i believe its a temporary relief.
Will have to fix it permanently.

Agree Steve, life is a lot educational :-)
Yup the fun has just begun.