Emergency Telnet Server Port Number Background Information - Cabletron Systems CSX1200 User Manual

USER'S GUIDE
E T S
MERGENCY ELNET ERVER
There are some Telnet client programs that do not clear Telnet connections when terminating
Telnet sessions. Since they do not clear the Telnet connections, those connections stay alive and
soon all Telnet sessions are used up. Once this happens, no more Telnet sessions can be established
until the inactivity timer of one of the sessions expires.
However, if the idle timer of the administrative session is disabled, you may need to reboot the
CyberSWITCH. To avoid this, a special Telnet server that uses a particular TCP port is provided. If
you Telnet into this special server (the Emergency Telnet Server) you will be placed into a session
which prompts you for an action on each of the existing Telnet sessions.
The emergency Telnet session allows you to terminate Telnet sessions only when all Telnet sessions
are used up. An emergency Telnet server is available to clean up dead Telnet sessions. This Telnet
server needs a unique port number in order to function.
The following example screen illustrates a successful emergency Telnet session:
Emergency Telnet session active
Enter password(s) for 'ADMIN' user.
Enter password: ******
Login-Id Sess-Id Date/Time
-------- ------- ------------ ---------- -------- ------------------------
ADMIN 257
Do you wish to terminate this session (Y or N) [default = Y]? <RET>
Login-Id Sess-Id Date/Time
-------- ------- ------------ ---------- -------- ---------------
ADMIN 511
Do you wish to terminate this session (Y or N) [default = Y]? <RET>
Login-Id Sess-Id Date/Time
-------- ------- ------------ ---------- -------- ---------------
ADMIN 734
Do you wish to terminate this session (Y or N) [default = Y]? <RET>
The following screen illustrates a situation where Telnet sessions are still available. The Emergency
Telnet session then simply informs you that you can not terminate Telnet sessions under these
circumstances (no emergency exists).
Emergency Telnet session active
Enter password(s) for 'ADMIN' user.
Enter password: ******
There are Telnet connections available for administrative sessions.
Please use an administrative session to terminate abandoned sessions.
154 CyberSWITCH
P N B
ORT UMBER ACKGROUND
Idle (sec) Command Type (From)
May 20 12:34 800 MANAGE
Idle (sec) Command Type (From)
May 20 12:30 1025 SHELL
Idle (sec) Command Type (From)
May 20 12:35 740 LOGIN
I
NFORMATION
Telnet (199.120.211.70)
199.120.211.71
199.120.211.69