Allied Telesis AT-S60 - Manual (Page 393)

Chapter 23: Secure Shell (SSH)
Section III: Security Features 392
This timer determines how often the server key is regenerated.
Naturally, a server key is regenerated for security purposes. A
server key is only valid for the time period configured in the Server
Key Expiry (Expiration) Time timer. Allied Telesyn International
recommends you set this field to 1. With this setting, a new key is
generated every hour.
The default is 0 hours which means the server key never expires.
The range is 0 to 5 hours.
8. Select 5 - Login Timeout.
This is the time it takes to release the SSH server from an
incomplete SSH client connection. Enter a time in seconds. The
default is 180 seconds (3 minutes). The range is 60 to 600 seconds.
9. Select 1 - SSH Server Status to Enable the SSH server.
10. Select Enable to enable the SSH server.
Note
Allied Telesyn International recommends disabling the Telnet server
before you enable SSH. Otherwise, the security provided by SSH is
lost.
11. After making changes, type R to until you return to the Main Menu.
Then type S to select Save Configuration Changes.