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cannot do a telnet from my pc

Rommel T. Misa_2
Frequent Advisor

cannot do a telnet from my pc

Hi all,

I can telnet from one rx6600 server (host01) running HP-UX 11.23 to another rx6600 server running HP-UX 11.23 (host02) also. But when I try to telnet from my PC, I can't telnet directly to host02 but I can telnet directly to host01. Please help.

Thanks!

ROMMEL
12 REPLIES
sujit kumar singh
Honored Contributor

Re: cannot do a telnet from my pc

Hi Misa,

Most Probably there is some network related config on the host host02, some privacy in the settings and network access, like you can telnet to host02 only from the network that host01 belongs or something.

Please get in touch with the network administrator for more clarity on the network Securities.

Regards
sujit
Rommel T. Misa_2
Frequent Advisor

Re: cannot do a telnet from my pc

thanks sujit. the two hosts are on the same network segment and there are no security configurations on that network.

ROMMEL
Ganesan R
Honored Contributor

Re: cannot do a telnet from my pc

Hi,

Check /var/adm/inetd.sec file on host02. Telnet service might have restricted with specific ip or network range.
Best wishes,

Ganesh.
Rommel T. Misa_2
Frequent Advisor

Re: cannot do a telnet from my pc

The inetd.sec file is still in default. No changes were made to this file.

ROMMEL
Rommel T. Misa_2
Frequent Advisor

Re: cannot do a telnet from my pc

Addendum: I can't also do a ping from my PC to host02.
Ganesan R
Honored Contributor

Re: cannot do a telnet from my pc

Hi,

If ping is not working then we may need to look into network part..

PC and host02 are on the same network? If no, have you configured gateway on PC?

Are there any firewall in between the pc and host02?
Best wishes,

Ganesh.
Rommel T. Misa_2
Frequent Advisor

Re: cannot do a telnet from my pc

PC and host02 are on the same network? >> Yes.

If no, have you configured gateway on PC?

Are there any firewall in between the pc and host02? >> No.

The problem is that the PCs in this network experience the same problem. They can ping/telnet host01 but can't do the same for host02. Verified all network-related files and paramters and all seems ok.
Ganesan R
Honored Contributor

Re: cannot do a telnet from my pc

Hi,

If it is in same network atleast we should be able to ping unless otherwise we have disabled ICMP protocal in router.

Are you able to ping host02 from host01?

Could you provide the netstat -in and netstat -i outputs from host02 and ipconfig output from pc?
Best wishes,

Ganesh.
Rajasekhar Gundu
Honored Contributor

Re: cannot do a telnet from my pc

Even if they are on same network, there is somewhere the breakage occuring it seems.

Can you do a tracert & then you can find where your packets are getting dropped off.


Regards,
Raj

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OldSchool
Honored Contributor

Re: cannot do a telnet from my pc

also, try forward and reverse lookup by IP address and name. Do this on host1, host2 and your PC.

I suspect that there might be an IP issue somewhere, like the PC using DNS while host1 and host2 use host files.

If that is the case, i suspect that host2 isn't in the DNS server, or if it is, has a different address. Another possiblity would be differing addresses for the same name, or differing names for the same IP
T G Manikandan
Honored Contributor

Re: cannot do a telnet from my pc

Please provide the ipaddress of host1 ,host2 and your PC.

Also provide

#netstat -nr

from host1 and host2.
Bill Hassell
Honored Contributor

Re: cannot do a telnet from my pc

> can't telnet directly...

What was the error message?

ALWAYS use the IP address first. If that works, then you'll have to sort out hostname resolution with NIS, DNS and hosts file. PCs are a real pain to configure because they depend on a WINS or DNS server which is often out of date. If the IP address works, then contact your network administrator to fix your WINS or DNS servers.


Bill Hassell, sysadmin