This post describes the SSH versions supported by the firewall.
By default, the earlier version-compatible function is disabled on the SSH server, and only V1.5 and V2.0 are supported.
The earlier version-compatible function of the SSH server is applicable to the protocol version negotiation between the client and server. After a TCP connection is set up between a client and a server, the client negotiates with the server on a version that both the client and server support.
The server compares its own version with that sent by the client and determines whether it can work with the client.
For details, see the USG6000E, USG6000, USG9500, and NGFW Module Troubleshooting Guide..
