When the proxy IP is invalid or has just failed, the client cannot connect to the proxy server and, therefore, cannot access the web page. To fix this issue, you can use a practical proxy IP. Typically, using a good proxy IP requires authorization, which can be done through two main methods: binding an IP address to the whitelist or using an account password. If authorization fails, the proxy IP cannot be used. Binding an IP address to the whitelist is one method of authorization. If your ter...