OWASP ZAP docker container hostname resolution

[msg life]

Hello,

I'm trying to configure OWASP-ZAP using owasp/zap2docker-stable image.

I'm able to access a specific hostname via command line on the container but it fails with using the proxy webswing reports a 502 BAD GETEWAY

For instance lets say I have an application running on http://my-app.dslocal.com:7000/appContext then:

• start owasp-zap container mapping zap/wrk folder
• create a session
• create a new browser (firefox) profile (to make it independent)
• set my browser (firefox) to use owasp-zap proxy
• add the .cert file as certificate on the browser (firefox) the cert file is found on the folder mapped to /zap/wrk
• when navigating to  http://my-app.dslocal.com:7000/appContext on the browser I get an ZAP Error [java.net.UnknownHostException]
• the webswing get the request but reports a 502 BAD GETEWAY
• connecting to the container 
  • docker exec -it myContainer bash
  • curl  http://my-app.dslocal.com:7000/appContext
  • I'm able to get a proper response

Is there some configuration that I'm missing?

Thank you