As mentioned earlier, there is no default value, you just need to create it by calling add-user.sh or add-user.bat script.
Here you will find documentation from Redhat ... basically what is said above. I would just like to highlight step 3 in the documentation:
3. Select an area for the user.
The next prompt indicates the area in which the user will be added. For a user with permissions to manage JBoss Enterprise Application Platform 6, select the default value, which is ManagementRealm .
If you need access to the console, just leave the default area.
Marco vargas
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