Possible Causes of a Failure in Verifying a Host

If connectivity verification fails for a host, check the following items:

1. Username and password.
2. Startup status.
3. Ports: Check that ports on the host have been enabled.
4. Firewall policy: Run the iptables -L -n command to check whether access over port 22 is restricted.
5. The IP address must be accessible from the public network. If you are using a private IP address, an SSH proxy is required.
6. CentOS version: If the host is running CentOS, ensure that the CentOS version is 6.0 or later.
7. Windows version: Ensure that your host is running a supported version and has been properly configured. For details, see "Host Configuration" in the User Guide.