How to make the program support communication behind NAT device?

[smith jack]

The subnet behind my router is 192.168.1.0/24, my pc ip is 192.168.1.9,
the server written with python is hosted on 192.168.1.3 on port 1033,
i can connect to this server from my pc

But cannot connect to this server when outside of this subnet? why?

I have made port translate on router, that is 10.10.9.2:1033 to 192.168.1.3:1033

what's wrong?