1. If it works with Server 2008R2's gateway, it will work with SBS's gateway. They are the same. I highly doubt it doesn't work since it's the main reason people buy that app. Are you sure the settings are correct?
2. Yes. The VPN uses a different port which you will have to open. It's PTTP VPN (some disadvantages compared to L2TP/IPSec, but it only takes a click to deploy).
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