Here is a tutorial how to setup port forwarding using Astrill Port Forward feature. This tutorial will show you how to do this for uTorrent, and you can do same thing with any other applications.
First, switch to OpenVPN mode and then enable the Port Forward feature from Astrill settings. If you do not see Port Forward feature under Settings, go to Help > Switch to Expert (this will show you all Astrill features).
Astrill will dynamically generate a ports for you. You can assign port forward for maximum of 3 applications.
Now run uTorrent application (You can run your preferred BitTorrent client of course, or any other applications which you want to port forward).
Change the port number of Bit-torrent client, that you generated with Astrill port forward feature.
Click OK to save your settings, now start your torrent download.
For bittorrent to work, you must select a server which is marked with * (asterisks). Those servers are specifically configured to allow bittorrent. If you do port forwarding for any applications other than bittorrent, then any server will work.
You should know that, when you are connected to OpenVPN, that your external IP address is no longer your ISP IP address, but your OpenVPN IP address.
<Your ISP IP Address>:<Local Port>
Astrill OpenVPN Connection:
<Astrill OpenVPN IP Address>:<Astrill External Port>
After you are connected, and started downloading you can check open ports with a web page or a terminal (command line). We will show you how to check open ports with terminal.
netstat -an | find /i "listening"
netstat -an | find /i ":41157"
Linux & Mac
netstat -l | grep 41157
Easy does it! Have fun!