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Unable to ping the HP UNIX server

 
trilok_pvp
Frequent Advisor

Unable to ping the HP UNIX server

Hi,

We have 6 HP unix servers in remote location. Earlier we are connecting through telnet to all servers. Now we are not able to reach one server. when we try to ping, we are getting timed out error. But the server is working fine, we logged on to the servers in remote location, from all servers it shows replay.

Regards
Trilok
12 REPLIES
Mel Burslan
Honored Contributor

Re: Unable to ping the HP UNIX server

There is not enough details in your question. Are all 6 servers in the same network or subnet ? What changed since the last time you accessed this server ? Patching maybe ? what is the server model and OS version ? Can you reach this server if you telnet from another server (one of the 5 servers that reachable) at this location ?
________________________________
UNIX because I majored in cryptology...
trilok_pvp
Frequent Advisor

Re: Unable to ping the HP UNIX server

HI

OS - HP UNIX 11.11
No changes had made. All 6 servers are located in same network with same subnet mask. From remote we are able to reach 5 servers and we are able to do telnet. To reach the perticular server, we are connecting to one of the 5 servers and connecting.
Mel Burslan
Honored Contributor

Re: Unable to ping the HP UNIX server

Please post the output of this command from one of the reachable servers and from the unreachable server (after you connect thru one of the local servers of course)

netstat -rn

looks like something or somebody, without knowing what they are doing, changed your routing tables. By looking at these two routing tables, you might even notice the difference and correct it on your own, but if you need help, please post them here.
________________________________
UNIX because I majored in cryptology...
Ganesan R
Honored Contributor

Re: Unable to ping the HP UNIX server

Hi Trilok,

If all the servers are in the same network, then it should be the routing issue. It is possible that, routing entry might have set temporaryly and gone away during a reboot. Check the netconf file if you have permenantly added the route entries.
Best wishes,

Ganesh.
Steven E. Protter
Exalted Contributor

Re: Unable to ping the HP UNIX server

Shalom,

Have the network hardware checked.

See if the problematic system has the same gateway setting in /etc/rc.config.d/netconf

See if you can get away with a reboot if none of the other factors are an issue.

Problem: You are using telnet. Telnet does authentication in clear text. Openssh, called secure shell is an install option and should be used in place of telnet. ssh encrypts authentication and data stream. Do you really want the root password sent across the network in clear text?

SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
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Sukumar Mody
Occasional Contributor

Re: Unable to ping the HP UNIX server

I think the startup script to add network route was not identical on all server and possibly one server lost power and when it when it restored power, it ran script and added routes accordingly. Check uptime on the server and see if you find it went down.
Tirtha
Occasional Advisor

Re: Unable to ping the HP UNIX server

check /etc/hosts
All entry are right or wrong..
Suraj K Sankari
Honored Contributor

Re: Unable to ping the HP UNIX server

Hi,

Are you able to login through console?
if yes then login and try to connect other server?
or check network is up or not


Suraj
trilok_pvp
Frequent Advisor

Re: Unable to ping the HP UNIX server

Hi

OMNO services are running in HP unix server. When i try run xomni command to get the GUI mode in windows XP system, i getting below error message. I had triedn by restarting the xomni services. but same problem repeating

Unable to register {registryprog, registryvers0
cannot register service
RPC_TIMED_OUT
Rita C Workman
Honored Contributor

Re: Unable to ping the HP UNIX server

Trilok,

Is this a Data Protector issue.....???

Your problem is obviously resolution, which it happens Data Protector is VERY sensitive about. DP requires perfection is reverse lookups.

So, confirm your /etc/hosts file is accurate on all boxes involved. You say you can get over to remote on some servers and then go the other one (least I think that's what you said). So check all your boxes for hostfile accuracy. Then make sure your /etc/nsswitch.conf is right. Most folks have:
hosts: files [NOTFOUND=continue]dns

So if your hostfile is right - you need to check DNS. If you don't run DNS, then confirm with the person who does that by having do reverse lookups for every server involved, it's hostname,IP and yes alias works correctly. Check every DNS server that might get used. If it's Windows DNS, and they are anything like the guys, they hate to hear me say - check reverse lookups for host/IP/alias. But that is usually where I find the issue. (not always..just usually)

Hope this helps,
Rita
Mel Burslan
Honored Contributor

Re: Unable to ping the HP UNIX server

I don't know which port the omni service is running on but, in an enterprise environment, firewall's usually block access to ports that are not standard. Not being able to register a service might be caused by not being able to access that service's port. Check with your network people and make sure firewall is not blocking this connection.
________________________________
UNIX because I majored in cryptology...

Re: Unable to ping the HP UNIX server

>When I try run xomni command to get the GUI mode in windows XP system

You created another thread:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1346466