PfSense blocks media streams
I've just moved on from a WRT54GL running Tomato to a dedicated pfSense setup. I'm still very new so please be patient.
pfSense seems to block some streaming connections. Whenever i try to visit http://dumpert.nl for example, the video buffers a couple of seconds and then stops buffering indefinately. Same thing goes for online radio streams on my receiver.
Firewall logs aren't helpful either.
Right now I haven't configured anything special, other than some static DHCP leases. Other settings are pretty much all factory default.
What can be causing this behaviour?
The site works just fine here behind pfSense. Send a crystal ball.