Console Servers User Guide 16 port , 24 port

Black Box Console Server user guide 256
You have lost or don't know your password (as ‘admin’ user)
you must reset the unit to its factory default settings using the ‘reset’ switch on the
rear panel. There is no procedure to access the unit without a password.
at the remote end the client software locks up
other factors: security (CHAP) is enabled on the line.
disable CHAP re-challenge parameter (challenge_interval) in the unit. Some PPP
client software does not work when receiving CHAP re-challenges.