NAD0157E The server host_name cannot be contacted. The server might be down, unreachable due to network problems, or the SSH credentials might be invalid.
Explanation
The server cannot be contacted. The server might be down or unreachable due to other connection failures or the server cannot be contacted using the credentials that are provided.
Action
Check the host name that is specified for the server. Check whether the host name can resolve to an IP address from a command line by using commands such as nslookup or ping. Check whether the user and password that are specified are valid. If SSH certificates are used for authentication, check whether the certificate and the passphrase are valid.