Allied Telesis AT-S63 - Manual (Page 653)

AT-S63 Management Software Menus User’s Guide
Section IX: Management Security 653
A change to the status of the management ACL is immediately
activated on the switch.
Note
If you activate the feature while managing the switch from a Telnet
management session, your management session will end and you
will not be able to reestablish it if the management ACL does not
contain an ACE that specifies your management workstation.
4. After making changes, type R until you return to the Main Menu. Then
type S to select Save Configuration Changes.