One Page Loads, and the Proxy Login Boxes Keep Coming

A page makes more than one request. Answering its first proxy login box may leave scripts, images or live connections taking other routes and receiving other challenges.

1. Find a failing resource. Keep its destination, selected proxy and 407 challenge. Compare those same fields with a resource that succeeds; the main page URL alone is insufficient.
2. Look for the shared difference. Failures may follow one resource host, separate HTTP/HTTPS paths, an extension or a PAC decision. A login accepted by one endpoint does not establish acceptance by another. Authentication caching also depends on challenge, identity and route scope.
3. Repair the identified exchange. Fix the route, account or supported authentication behavior, then inspect both page behavior and the resource results.

Typing the same password repeatedly supplies little evidence until that scope is known. Early browser workarounds such as disabling WebSockets, blocking scripts or changing extensions may remove the request that triggers a prompt while also removing a needed feature.

Blocking an unwanted resource can be a deliberate policy choice. Describe that outcome as blocking, rather than proof that authentication now works. A quiet page missing its required real-time connection has not met the same result as a working page using the intended routes.