In Junos Space Network Management Ver. 15.1
When trying to discover SA-2500 VPN appliance and getting the following error:
SSH connection failed. Device might not be reachable through device management interface.
This is because Junos Space will only manage devices that are running Junos 9.3 or higher. Any other operating system cannot be managed. Although you can have “unmanaged” devices whereby Junos Space and more specifically OpenNMS is performing SNMP monitoring only, You wouldn’t have the ability to perform configuration backups, configuration changes, software upgrades etc., with any unmanaged devices.
The supported platform list can be found at the following URL: