Potential Cause of "ssh not connected"

Several common misconfigurations, as listed below, might cause failure to connect to an active server using SSH.

1. Network service not started:
# service network start

2. SSH service not started:
# service sshd start

3. Wrong firewall configuration:
# iptables -F

4. Authentication error
Remove the entry containing the server IP in ~/.ssh/unknown_hosts

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