Forcing Vuze to use only your VPN

Connect to the VPN.

In Vuze menu go to "Tools" > "Options"
Under "Mode", select "Advanced"
Go to "Connection" > "Advanced connection settings".

Find the VPN related adapters, which may be:

    TAP-Win32 Adapter
    WAN Miniport (PPTP)
    WAN Miniport (L2TP)
(or any other)

TAP adapter is responsible for OpenVPN connections.
WAN Miniports for PPTP and L2TP connections.

Enter the interface identifier into the field next to "Bind to local IP address or interface".

Note that the interface identifier is named different on every system, so make sure to check how exactly it is called on yours. e.g. "eth15" "net2" "net1" "ppp2" etc

For testing enter it into the field and click "Save".

When you're disconnected from the VPN , downloads in Vuze should immediately stop.

You may append interface identifiers after each other, entering "eth15;net1;net2" into the field.