3Com MSR 50 Series Configuration Manual page 807

If you cannot locate the problem, save the debugging information of both the
router and the Unix server and send it to a customer service engineer to locate it.
Change the corresponding pseudo terminal on the Unix server
If the above-mentioned procedure cannot solve the problem, try to use another
pseudo terminal on the Unix server corresponding to the terminal by following
these steps:
1 If the pseudo terminal is an active terminal, sign off; if it is a dumb terminal,
terminate it from the banking service process and delete its configuration in the
configuration file of the banking service.
2 Modify configuration file ttyd.conf on the Unix server to change the original
pseudo terminal to a new pseudo terminal.
If the new pseudo terminal is an active terminal, make sure that you have enabled
it. If it is a dumb terminal, configure the terminal in the configuration file of the
banking service.
3 Use the process management function of the ttyd administration program or the
kill command to kill the ttyd child process corresponding to the original terminal,
or run the ttyd administration program and use the menu for refreshing
configuration file to refresh ttyd program configuration.
If the new pseudo terminal is a dumb terminal, activate this terminal in the
banking service process.
Terminal Access Troubleshooting 807