Hello.
Please create a new topic for a new question.
What WCS version do you use? In the latest versions CLI was separated to WCS core CLI (on port 2001) and WCS manager CLI (on port 2000). You can log in to WCS core CLI with username admin and password admin by default. To log in to WCS manager CLI you have to use admin password that you have set to WCS web interface, not Linux root password.