Hello,
I´m having exactly the same problem, I wrote to pd proxy support ant they replied me this:
"Our UDP servers are online. If you cannot connect then it is possible that UDP is being blocked on your internet connect. You need to make sure that UDP packets are allowed to pass on your router."
My internet connection is through a 3g modem from Digitel in Venezuela and I have no idea how to know is my internet connection is blocking UDP ports, I´m using windows 8 please help me to solve this since ICMP servers are too slow.
Regards