I set up Zap proxy. I see it received traffic from other sites except for: http://quiz.aisolutions.com.vn/. It just hung at the login. Tried several ways like changing port number to 8082 but not work
If you're launching the browser from ZAP then there's a small chance it's because of something that the ZAP HUD is doing (in order to function it injects JS and upgrades some links to https, etc.).
Try disabling HUD, launching a browser, and hitting the site again.
You'll see the HUD Radar Icon in the toolbar. When the icon is selected the HUD will be added to your browser.