System information

Troubleshooting Dialin Connections 16-359
Dialin: Dialin Session Ends Up in Existing Session
Dialin: Dialin Session Ends Up in Existing Session
Symptom: Remote dialin session ends up in an already existing session initiated by another user.
That is, instead of getting a login prompt, a dialin user sees a session established by another user
(which might be a UNIX command prompt, a text editor session, and so forth).
Table 16-8 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 16-8 Dialin: Dialin Session Ends up in Existing Session
Modem speed setting is not locked
Step 3 Use the show line exec command again and confirm that the line
speed is set to the desired value.
Step 4 When you are certain that the access server or router line is
configured for the desired speed, initiate a reverse Telnet session to
the modem via that line. For more information, see the section
“Establishing a Reverse Telnet Session to a Modem.”
Step 5 Use a modem command string that includes the lock DTE speed
command for your modem. See your modem documentation for
exact configuration command syntax.
Note: The lock DTE speed command, which might also be referred
to as port rate adjust or buffered mode, is often related to the way in
which the modem handles error correction. This command varies
widely from one modem to another.
Locking the modem speed ensures that the modem always
communicates with the Cisco access server or router at the speed
configured on the Cisco auxiliary port. If this command is not used,
the modem reverts to the speed of the data link (the telephone line)
instead of communicating at the speed configured on the access
server.
Possible Causes Suggested Actions
Modem configured for DCD always
high
Step 1 The modem should be reconfigured to have DCD high only on CD.
This is usually done with the &C1 modem command string (see
Figure 16-1), but check your modem documentation for the exact
syntax for your modem.
Step 2 You might have to configure the access server line to which the
modem is connected with the no exec line configuration command.
Clear the line with the clear line privileged exec command, initiate a
reverse Telnet session with the modem, and reconfigure the modem
so that DCD is high only on CD.
Step 3 End the Telnet session by entering disconnect and reconfigure the
access server line with the exec line configuration command.
Possible Causes Suggested Actions