Using Microsoft's freely available PortQueryUI, you can check to make sure your network is configured properly to allow VPN traffic.
Download PortQueryUI from http://download.microsoft.com/download/3/f/4/3f4c6a54-65f0-4164-bdec-a3411ba24d3a/PortQryUI.exe
Open the PortQryUI file by double-clicking on it and select Unzip.
It will extract to C:\PortQryUI folder by default
Go to C:\PortQryUI and run portqueryui.exe
Type in us-pptp.unovpn.com for the Destination IP
Select Manual input query ports and type 1723.
Set Protocol to TCP and Press Query.
Check what it says beside TCP port 1723 (pptp service):
If it says FILTERED or NOT LISTENING then please enable TCP port 1723 and enable PPTP pass-through on your router and device firewalls.
If it says LISTENING - Your firewall settings are correct, check password and try another UnoVPN server.