IP authorization uses port 3128. If you have incorrectly set the proxy’s port to 4444 (which is for username/password authorization), the proxies will continuously prompt you for the username/password. Please make sure to set the correct authorization method on your proxy DASHBOARD. If you chose IP authorization, the proxy dashboard should be set to IP authorization accordingly. Be sure you have properly authorized your IP in your dashboard. You can simply follow this video guide HERE. Otherwise, if the proxy dashboard is set for username/password authorization, and if you configure your proxies to use port 3128 for IP authorization, the proxies will continuously prompt you for the username/password, as the proxies will follow your proxy dashboard’s settings.