No your BT Business Hub will not block any services including Virtual Private Networks (VPNs). Sometimes you might have to configure your hub to work with the service.
To do this on the BT Business Hub 2 - 2700 or 2701, see set up Port forwarding in the 'get help with your hub...' guide.
You'll need to know which of the 65,000 ports your service needs opened. If you don't know this contact us or whoever supplies your service.
Not sure which hub or router you're using? Find your model.
Need support for other hubs and routers? Check out our other help articles.