Diagnose SSH connection resets before changing server configuration

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An SSH connection reset occurs after the TCP connection is established but before authentication begins. To diagnose, first run the SSH client in verbose mode to see where the connection stops. Next, verify basic TCP connectivity to the SSH port using tools like netcat. Then, check the server's SSH service status and logs for clues. Finally, before altering configuration, confirm if a security tool like Fail2ban has blocked the client's IP address.

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