hpux telnet session is getting hung after about 15 minutes Post: 302359542

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Operating Systems HP-UX hpux telnet session is getting hung after about 15 minutes Post 302359542 by Gecko12332 on Wednesday 7th of October 2009 12:02:25 AM

10-07-2009

Registered User

Quote:

Originally Posted by mhbd

Hi All,

We access our server from Windows m/c through telnet sessions. But for unknown reason any telnet sessions are getting hung after about 15 minutes idle time. Then we close it and open another new session which works fine.

Hey -
There could be a few things going on:
1) If you are using HP-UX outta the box 11.11 telnetd(aemon) via inetd, then check to make sure you don't have a $TMOUT variable is set upon login. The standard telnetd with HP-UX will look at this var. IE: echo $TMOUT If there is a value, you can set to =0 OR find out you .profile, .login, etc and change. Then you can update the 'skel' login files which should live in /etc/skel.
2) If 1) is not the case, then talk to your network admin, they might have certain rules invoked that even though you have an active TCP connection over telnet, if there isn't any generating traffic, the inline router, (if routing) TCP session timeout configured at switch level, or even an active state-full firewall that will drop connections after X time. You can also sorta trick 'schtuff' like this by setting a TCP keep-alive ACK via ndd in HP-UX. I say, "sorta" because depending on the level of experience your network admin has and the equipment, you can also set known keep-alive watchdogs that will do deep packet inspection and see that it's nothing but a keep-alive and still close the connection for security reasons; once again, depending on your environment.

To modify your HP-UX host to send keep-alives for telnet try this:
1) cp -p /etc/rc.config.d/nddconf /etc/rc.config.d/nddconf.prior_keep_alive
2) vi /etc/rc.config.d/nddconf

Look for "NDD_NAME" (minus quotes)
Uncomment (remove #) if needed and put:
NDD_NAME=[0]=tcp_keepalive_interval

THEN set the interval:
NDD_VALUE[0]=300000

This will send a keep-alive data packet every 5 minutes. Each minute is 60000, so set for how often you would like.

Save and exit and run: ndd -c which will change the parameter without rebooting.

Once again, could be some timeout on the host, or network idle timeout. Good luck!

Gecko12332

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LEARN ABOUT DEBIAN

portslave

portslave(8)							     Portslave							      portslave(8)

NAME

       portslave - terminal server program.

SYNOPSIS

       portslave [+config-file] port|-

DESCRIPTION

       This manual page documents briefly the portslave, program.

       This program is a getty replacement that will run it's own version of pppd, the user can specify their user-name via a login: prompt or PPP
       PAP negotiation.

       After the username and password have been supplied the user will be authenticated by the RADIUS protocol.

OPTIONS

       An optional first parameter is '+config-file' to specify an alternate config file.  The default is /etc/portslave/pslave.conf .

       The next parameter is either the port number or '-'.  The value '-' means that portslave is to use  it's  controlling  tty  as  the  serial
       device  and  inspect  the  config  file to find the RADIUS port number which matches that.  This was originally written for telnetd support
       (telnetd puts a '-' as the first command line parameter) but can be used for other things.

       To run over the telnet protocol put a config entry similar to the following in your inetd configuration:

       telnet stream tcp nowait root /usr/sbin/tcpd /usr/sbin/in.telnetd -L /usr/sbin/portslave

       Then in the pslave.conf file put a series of entries specifying every pseudo-tty device (either ptyp0,  ptyp1,  etc  or	pts/1,	pts/2  etc
       depending  on which type of device naming you use).  For the RADIUS port numbers which are to be used for telnet connections you must spec-
       ify the initchat as an empty string.

       If you want to run portslave over a clean TCP connection (no telnet protocol) then put the following in your inetd configuration:

       telnet stream tcp nowait root /usr/sbin/tcpd /usr/sbin/portslave -

AUTHOR

       This man page was written by Russell Coker <russell@coker.com.au>.  May be freely used and distributed without restriction.

SEE ALSO

       pslave.conf(5), pppd(8), ctlportslave(1) http://doc.coker.com.au/projects/portslave/

Russell Coker <;russell@coker.com.au>				    2010.03.30							      portslave(8)