First off, I'd like to say thank you for making ghostwall freely available to the public. I just did a reinstall of windows and decided to try ghostwall for the first time (I need a low-footprint firewall for this Win2k 800mhz / 320MB laptop). Using other firewalls I never had this problem, but after some frustration I discovered that ghostwall was the cause of activesync not being able to establish communication between windows & my smartphone via activesync 4.2 or 4.5. I didn't think to look there as I thought firewalls only affected internet traffic. On MS page http://www.microsoft.com/windowsmobile/help/activesync/default.mspx it says this: ActiveSync also uses the following ports for communication to/from these processes: Inbound TCP: 990 999 5678 5721 26675 Outbound UDP: 5679 I wasn't sure how to figure out to set that up on ghostwall so I wound up uninstalling it. I saw the only thing being blocked in the ghostwall gui stats was UDP, so I inputted 5679 as the outgoing port, with the associated things as "any" and "allow" but it didn't make a difference.