Allied Telesis AT-S39 - Manual (Page 44)

Section II: Local and Telnet Management
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For example, if you specify 2 minutes, the AT-S39 management
software automatically ends a management session if it does not
detect any activity from the local or remote management station
after 2 minutes.
3. To configure web browser access, type 5 to select Web Server Access
and, when prompted, type E to enable web access or D to disable
web access.
For example, if you disable web access, no one will be able to
manage the switch remotely using a web browser.
4. To configure SNMP access, type 6 to select SNMP Access and, when
prompted, type E to enable SNMP management access or D to
disable it.
For example, if you disable SNMP access, no one will be able to
manage the switch remotely using an SNMP management
program.
5. After you have made the desired changes, type S to select Save
Configuration Changes.
Your changes are immediately activated on the switch.