6. Authentication Protocol Message Numbers

The following message numbers are used by the authentication protocol:

SSH_MSG_USERAUTH_REQUEST            50
SSH_MSG_USERAUTH_FAILURE            51
SSH_MSG_USERAUTH_SUCCESS            52
SSH_MSG_USERAUTH_BANNER             53

In addition to the above, there is a range of message numbers (60 to 79) reserved for method-specific messages. These messages are only sent by the server (client sends only SSH_MSG_USERAUTH_REQUEST messages). Different authentication methods reuse the same message numbers.