WAS v8.5 > Reference > SetsExternal realm name
Use this page to add a WebSphere Application Server realm that is external to this cell. The realm is initially not trusted. Use the Trusted authentication realms - inbound page to establish trust.
To view this dmgr console page, click Security > Security domains. Select a domain to edit or create a new one. Under Security Attributes, click User realm. Click Customize for this domain and then select a Realm type. Click Configure. Under Related items, click Trusted authentication realms - inbound or Trusted authentication realms - outbound. Click Add External Realm....
External realm name
Use to specify the name of the realm that is external to the list of realms available to receive trust.
Reference:
Trust all realms