Same issue. Testing the VMware Appliance before I make the move to the Hyper-V when the server gets delivered. After a reboot I can't access the admin page, and performing
http://openvpn.net/index.php/access-server/section-faq-openvpn-as/69-virtual-appliance/433-why-cant-i-access-the-adminclient-ui.html works, but I have to setup everything again