Symptoms
Web Server NG server role is not available is the list when registering a new node in OA. Linux Shared Hosting module is installed in OA CP > Infrastructure > Modules.
Cause
Linux Shared Hosting NG Service Module must be allowed by OA license.
Resolution
Check the license key options at OA CP > System > Information > Product License and make sure that Linux Shared Hosting NG Service Module is shown as available there.