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Operating Systems AIX Telnet sessions stay as idle users Post 302935227 by bakunin on Friday 13th of February 2015 02:29:06 PM
Old 02-13-2015
If these sessions indeed sit there at the login prompt there is little you can do. There is DGPicketts suggestion of using truss and/or lsof to terminate sessions, but this is a workaround rather than a solution.

If you have many and rapidly changing connections (although this should be no problem with typical telnet connections, other protocols are more prone to that) you might want to tune the keepalive-parameters in AIX to allow for faster closing of already closed sessions: TCP sessions getting into the state FIN-WAITING (see netstat -a output) take some time to become finally closed and this can pose a problem if very many connection-attempts are done in a short time. Usually this is the case with the Oracle-Listener connections in DB-servers with many clients but the same can happen with other protocols too.

Check the network options with the command

Code:
no -a

and look at the values of: tcp_keepintvl, tcp_keepidle and tcp_keepinit.

You can change these parameters (they are measured in half-seconds, hence i.e "150" means 75 seconds) with the command:

Code:
no -o <parameter>=<value>

Be sure to read the man page of no before changing anything because these tuning parameters can heavily affect the network output of your system!

I hope this helps.

bakunin

Last edited by bakunin; 02-13-2015 at 03:36 PM..
 

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SSL_CTX_set_timeout(3)						      OpenSSL						    SSL_CTX_set_timeout(3)

NAME
SSL_CTX_set_timeout, SSL_CTX_get_timeout - manipulate timeout values for session caching LIBRARY
libcrypto, -lcrypto SYNOPSIS
#include <openssl/ssl.h> long SSL_CTX_set_timeout(SSL_CTX *ctx, long t); long SSL_CTX_get_timeout(SSL_CTX *ctx); DESCRIPTION
SSL_CTX_set_timeout() sets the timeout for newly created sessions for ctx to t. The timeout value t must be given in seconds. SSL_CTX_get_timeout() returns the currently set timeout value for ctx. NOTES
Whenever a new session is created, it is assigned a maximum lifetime. This lifetime is specified by storing the creation time of the session and the timeout value valid at this time. If the actual time is later than creation time plus timeout, the session is not reused. Due to this realization, all sessions behave according to the timeout value valid at the time of the session negotiation. Changes of the timeout value do not affect already established sessions. The expiration time of a single session can be modified using the SSL_SESSION_get_time(3) family of functions. Expired sessions are removed from the internal session cache, whenever SSL_CTX_flush_sessions(3) is called, either directly by the application or automatically (see SSL_CTX_set_session_cache_mode(3)) The default value for session timeout is decided on a per protocol basis, see SSL_get_default_timeout(3). All currently supported protocols have the same default timeout value of 300 seconds. RETURN VALUES
SSL_CTX_set_timeout() returns the previously set timeout value. SSL_CTX_get_timeout() returns the currently set timeout value. SEE ALSO
ssl(3), SSL_CTX_set_session_cache_mode(3), SSL_SESSION_get_time(3), SSL_CTX_flush_sessions(3), SSL_get_default_timeout(3) 1.0.1i 2009-07-20 SSL_CTX_set_timeout(3)
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