How to change PPTP VPN client's port number? I saw this post: Change PPTP control connection's TCP port number and I successfully did it on my PC.

But how do I change Android's PPTP VPN client's port number? My Android phone is rooted and I installed a terminal emulator so I can run Linux commands. 

Which commands do I need to run?
use
serveripaddress:portnumber

example
111.200.123.55:1755

this way you are over ruling the default 1723 pptp port 
but make sure the server is listening to the new port