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How can i send to SSHClient custom error message from SSH Server if connection not allowed.

For example, my ssh server for each connection checks userName, password and clientIP. How can i send error message to client in case of login/password is correct, but IP is blacklisted?

SSH protocol doesn't allow to send user's error message in authentication process. Moreover, it forbids to specify such messages, because it reduces security. The more information a violator knows, the easier it is for him to break-in.