About the initial administrator account

After you've installed Portal for ArcGIS and configured it for use, you can access the portal website. At this time you need to provide the name, password, email, and identity question and answer for a new account that you will initially use to log in to the website and administer your portal. This account is called the initial administrator account.

The initial administrator account user name and password are stored by Portal for ArcGIS. The initial administrator is not an operating system account, and it has no relation to the Portal for ArcGIS account. Later, you can specify other accounts as administrators, demote the initial administrator to a member in the publisher or user role, or delete the initial administrator if you choose.