During browsing, error messages with the code may appear 407 proxy authentication required, after which the requested page will not be displayed. This problem means that the problem is from the client side, or rather, from the proxy server, which is an intermediary between the client and the server of the web resource.
The problem is solved as follows:
- enter the username and password that are used on the proxy server;
- disable the proxy server and contact the site server directly;
- turn off the VPN if it is in use;
- use a different proxy server or VPN.
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