I got the same problem on VPN and firewall on my 710+, really headache.
1. VPN server is not work (VPN version: 1.1-2197) 2. Cannot use "DiskStation.local" to log in DSaudio, DSphoto+, DSfile under the same network, unless use ip: 192.168.1.100. 3. Port 22,23,80 are open but port 5000 is closed which is accessible at DSM3.2 4. Firewall must turn on option "allow access if above rule is not match"