Connecting to a server using the Transfer Tool results in: Permission denied (publickey,gssapi-keyex,gssapi-with-mic)

Symptoms

When using the Transfer Tool to connect to a remote server, you received the following error, where SOURCE_IP is the remote server's IP address:

The remote basic credential check failed due to an error (The password that
you provided is not correct, or the SSH key is not permitted access:
Permission denied (publickey,gssapi-keyex,gssapi-with-mic).)
and response: Connecting to SOURCE_IP:22 as root...using method password...

Description 

This occurs when using "Password" as the Authentication Method in Transfer tool, and the remote server does not allow password authentication in SSH via the following option in /etc/ssh/sshd_config:

PasswordAuthentication no

Workaround

Option 1: If you have generated an SSH Public Key, use "SSH Public Key" instead  of "Password" as the Authentication Method.

Option 2: Enable password authentication in the remote server's SSH configuration file.