Could not open a connection to host on port 23 : Connect failed

[Nikee Reddy]

Hello,

Due to some reason, we are unable to connect to the server using the telnet nor the rlogin.

How to correct this problem?

Thank you,
Nikee

[Noble Sebastian]

Hi Srinikesh,

U can check network ..?
give me flowing answer ..

1 How to server conneted telnet .?

2 server it self working
3 network have firewall

rever back

Noble

[Nikee Reddy]

Hello Noble,

The system is running fine. The Orcale and SAP systems are also up and runnong on this server.

Around 100 users are connected as well.

We do not see any network issues at all and the server is inside the netwrok.

Thank you,
Nikee

[A. Clay Stephenson]

Well, the possible reasons are legion. I would start by examining the "exec" and "telnet" entries in /etc/inetd.conf. They could be commented out. If so, uncomment them and execute "inetd -c". Can you ping this box? If so but nothing else works (telnet, rlogin, ftp ...) then its likely the that inetd daemon has died and needs to be restarted.

[Basheer_2]

Hi Nikee

can you login to console or gsp and then


1) make sure telnetd daemon is working on the servers your ar trying to connect

2) see if you can connect using ssh

3) $ netstat -a | grep telnet
tcp 0 0 *.telnet *.* LISTEN

4) $ grep telnet /etc/services
telnet 23/tcp # Virtual Terminal Protocol

[Torsten.]

All 100 users are connected with telnet?

How about the maxusers value?

[Nikee Reddy]

Naaaaa..

100 users connected using SAP application.

Thank you,
Nikee

[A. Clay Stephenson]

What are your current settings of npty, nstrpty, and nstrtel?

[Nikee Reddy]

Hello,

Where can find the settings for the following parameters?
npty, nstrpty, and nstrtel..

As far as I know, we haven't changed any values..They all have Default values..

Thank you,
Nikee

[Dennis Handly]

>Where can find the settings for the following parameters?
npty, nstrpty and nstrtel

You can grep the result of kmtune(1m) (11.11) or kctune(1m) (11.23 and on).

[Nikee Reddy]

Hello All,

Is there a way to restart the following daemons?

telnet
rlogin

Thank you,
Nikee

[Torsten.]

They are started by inetd. see 3. post.