PfSense 2.2 RC can't access DNS
I've just installed a fresh copy of pfSense 2.2 RC and setup an OpenVPN server the exact same way as I did on pfSense 2.1.5. When clients connect to the server, they're able to access the LAN and the WAN, however, only if they type in the IP address. They're not able to access the DNS resolver. This exact configuration (and FW rules) worked fine with pfSense 2.1.5. When I checked the DNS resolver settings, I noticed that the OpenVPN interface was missing, so I've added the OpenVPN network to the access list. This didn't fix the problem.
quirk of unbound. We work around it where you bind to all interfaces, but don't otherwise because enabling the option in question causes unbound to bind to all interfaces.
https://redmine.pfsense.org/issues/4111 has the details