Setup Landscape following the Manual install guide @ https://help.landscape.canonical.com/LDS/ManualInstallation17.03
When I get to the end "Setup first user" the form loads and I fill it out. When I submit, the "Sign up" button just fades out, this was under Firefox 57. Under Google Chrome I get a redirect to "about:blank."
I have SSL setup properly with a Green Lock across all browsers. Setup appeared to go smoothly after I opened the port on the database server in the firewall. Both Database and Application server are Ubuntu Server 16.04.3 LTS running in a production VMWare environment. Enterprise DNS is working along with SSL cert from Entrust so I do not think this is related @ landscape registration