Unable to connect network interface by telnet, even ping

[Jeong-Hwan Kim_1]

hello, guys
i've faced some strange situation here

* RX5670
* HP-UX 11i (11.23)
* Network Interface
0/1/1/0/4/0 0x00306EA7FB19 0 UP lan0 snap0 1 ETHER Yes 119
0/4/2/0 0x00306EEAC1D0 2 UP lan2 snap2 2 ETHER Yes 119
0/4/1/0 0x00306EEA41B8 1 UP lan1 snap1 3 ETHER Yes 119

* Sympton
System & all applications are going well, but can't make any network connection. no telnet, no ping, both in and out way.

[Rajeev Shukla]

1. Check if you have a file /var/adm/inetd.sec with a line called telnet allow/deny ...check if the logic defined there is correct

2. Check if the subnet mask and gateway defined for all the configured Interface cards is correct

[Warren_9]

hi,

how about other network services, such as ssh, ftp, http...etc? any firewall in between the client and the host?

is it possible to "telnet localhost" in console? or ping localhost?

GOOD LUCK!!

[Jeong-Hwan Kim_1]

Thanks all of you.
The Server is running well all days including networking service. but, suddenly can't make any network connection incl. http, ftp, telnet, ping, etc.

I didn't try networking for localtest, i mean, 'telnet localhost or ping localhost'. As soon as the same problem is occurred, i'll try self-test.

[Andrey Tumanov]

1. Check cabling
2. Verify that your netadmin haven't changed your switch port configuration
3. Make sure inetd is running
4. Make sure there is no duplicate IP configured in your network
5. Review the last changes you made
6. Check /etc/rc.config.d/netconf to make sure it's properly configured

Any of those could help... good luck.

[Darrel Louis]

Hi,

Can you perform "inetd -c" to reinitialize the services. Can you check the syslog.log for any error messages.

Can you post the output of:
- netstat -af inet
- netstat -rn

Goodluck

Darrel

[Prashant Zanwar_4]

Check your default route and router .. traceroute should be able to help you upto some level about what is happening
Check if any firewall rules have changed ..

Prashant

[Jeong-Hwan Kim_1]

the network problem has been occurred twice during two couples of months.
but it's never been occurred since i posted on forum.

On finding the same kind of problem, i'll post the results of check points you all recommended.

Thanks again.