SBG 7.x , 8.x :

Use the sshdver command to configure the version of the SSH protocol used by the Brightmail Gateway.

To check the SSH protocol used:

1. Log in as admin to the Symantec Brightmail Gateway Command Line Interface.
2. Enter the following command:
   sshdver -v

To force SSH protocol version 2:

1. Log in as admin to the Symantec Brightmail Gateway Command Line Interface.
2. Enter the following command to force SSH protocol 2 to be used:
   sshdver 2

SMG 9.x

Use the sshd-config command to configure the version of the SSH protocol used by the Messaging Gateway.

To check the SSH protocol used:

1. Log in as admin to the Symantec Messaging Gateway Command Line Interface.
2. Enter the following command:
   sshd-config -v

To force SSH protocol version 2:

1. Log in as admin to the Symantec Messaging Gateway Command Line Interface.
2. Enter the following command to force SSH protocol 2 to be used:
   sshd-config -v2

References
From Symantec Brightmail Gateway 7.6.1-14 Release Notes document:

Enhancement to support setting SSH protocol version

Due to reported vulnerabilities in SSH protocol version 1, a new CLI command has been developed, sshdver.
The sshdver command can be used to configure SSH version 2.
This command must be run manually--as making the change automatically could cause system management problems
for customers who have configured access in a manner reliant on protocol version 1.
It is highly recommended that all customers switch to using protocol version 2 exclusively, once their data center infrastructure
has been modified to support using that protocol version.