An IP proxy server acts as a middleman that transfers data between a client and an application server. To the application server, the IP proxy server is considered the client. To access the application server, the client must first connect to the IP proxy server.

If the proxy IP becomes unavailable, it may be due to network instability, a blocked IP address, or problems with the server configuration. This can prevent the client from accessing the application server, causing inconvenience. To resolve this issue, it's crucial to use a valid proxy IP that provides stable and fast connections, professional customer service support, and complete functions.

To use a high-quality proxy IP, authorization is usually required. The two main authorization methods are binding IP allowlist and account password authorization.

• Binding IP allowlist authorization requires a fixed terminal IP. If the terminal IP is not fixed, this authorization may fail, and a username and password login window will pop up. However, even with the correct username and password, the webpage may still be inaccessible.

• Account password authorization requires the correct username and password to be entered. If the input is incorrect, access to the webpage will be denied.

In some cases, using the proxy IP may result in restrictions imposed by the anti-crawling strategy of the target website. To avoid this issue, it's recommended to use a new proxy IP and always follow relevant laws and regulations when using proxy IP services. Choosing a high-quality proxy IP provider can ensure a more efficient and convenient use process.