Encountering difficulties in connecting to the target host? Ensure that the specified SSH Port is valid and that the target host is powered on.

Cause 1: The target host is offline.

Cause 2: Firewall is enabled on the target host.

1. Make sure that the target host is powered on.

2. To check the Firewall status in a Linux Machine, use the command specific to your distribution:

1. For Ubuntu: `sudo ufw status`
2. For Fedora: `systemctl status firewalld`

   If the Firewall is active, add firewall rules for SSH port 22 and backup port 42005:

   For Ubuntu:

iptables -A INPUT -p tcp --dport 22 -j ACCEPT

iptables -A INPUT -p tcp --dport 42005 -j ACCEPT

   For Fedora:

          sudo firewall-cmd --zone=public --add-port=42005/tcp