Connection Closed by remote host in Putty

How to Fix the error "Remote connection closed by host" in Putty?

  To fix the error, enable two-factor authentication in Ezeelogin ( Google Authenticator, Duo, Access Keyword, Yubikey, and Radius ). You can Enable 2FA from Ezeelogin WebGUI. 

1. This usually happens when ezeelogin Two-factor authentication is not set and needs to be set by logging in to the GUI and setup the desired authentication like Google Authenticator, DUO, Access Keyword, Yubikey, and Radius.