Web Hacking - Manually Discovery

Hi,
I’ve setup kali and aether target. The first is 192.168.1.111 and the second 192.168.1.138.
The last setup I did is on FoxyProxy add-on in Firefox with localhost.
When, in the Kali linux, using the new proxy I try to open http://192.168.1.138/ve/, the proxy server is refusing the connection.
In Burp Suite I receive the request but no response, off course.

Where I’m wrong?

Thanks
Gianluca