In rare cases, an admin may introduce a typo in the public domain of the admin UI while configuring the DNS or the hosts file. Accessing the same will result in a HTTP 400 error in the browser. This article will show the steps on how to retrieve the correct public domain of the admin UI. 

• Okta Access Gateway (OAG)
• Admin UI
• Okta Identity Engine (OIE)
• Okta Classic Engine

When the OAG admin UI is configured, a redirection is created from https://admin in the backend application config that will take the user to the configured public domain. 

To retrieve OAG Admin UI public domain name: 

1. Map the appliance IP in the client's hosts file to "admin". 
2. Access https://admin in the browser. The browser will redirect the user to the correct domain value.
3. Copy the public domain from browser address bar and do the necessary DNS/hosts changes.