Failed to connect, CredSSP required by server
ERROR: CredSSP: Initialize failed
CredSSP required by server is an error line returned when trying to connect remotely to a Windows machine using RDP version 6 or newer with the Rdesktop client.
We can use the tool xfreerdp to connect to remote machine instead of traditional rdesktop tool in-order to solve this problem.
#xfreerdp /u:username /p:'password' /v:host
Here we need to replace username, password and host with the appropriate values.