can you access the Admin-Console from inside your local network? Also in the Settings did you check Access Restriction for the Admin Console?
I prefer to manage my servers using remote desktop access which avoids this complication. I prefer that approach as I sometimes need to do other tasks with the server besides what can be done from the admin console. Since I need to access the desktop remotely for those tasks anyway, I just open the console on the server machine via my RDP session and do whatever is needed...