http://localhost:9990/error/index_win.html refers to add-user.sh

Welcome to EAP 6

Your JBoss Enterprise Application Platform is running.

However you have not yet added any users to be able to access the admin console.

To add a new user execute the add-user.sh script within the bin folder of your EAP 6 installation and enter the requested information.

By default the realm name used by EAP 6 is "ManagementRealm" this is already selected by default.

After you have added the user follow this link to Try Again.