If the Terminal screen on a server’s Cockpit page is illegible, you’ll need to set the site permissions from your client web browser.
Go to the site at http://x.x.x.x:9090, login, click the Terminal option.
Click the lock icon in the address bar.
Click on Connection Not Secure.
Click on More Information.
Click on the Permissions icon.
Under “Extract Canvas Data”, unselect “Use Default” and select “Allow”.
Refresh the page. You may have to change the font size.