First, check the network connection
Before we start solving the problem, make sure your internet connection is working. Just like sometimes the TV signal is not good, network problems can cause proxy IP acquisition failure. Try restarting your router or connecting to it with a mobile hotspot to see if it's a network issue.
Verifying proxy server information
Next, make sure you enter the correct proxy server address and port number. It's like mailing a package, if you write the address wrong, the package won't be delivered. Double check again to see if there are any input errors. Try using a different proxy server and see if that solves the problem.
See if the proxy server is "on vacation"!
Sometimes, a proxy server may be temporarily unavailable due to maintenance or malfunction. You can check the website of the proxy service provider or contact their customer service to ask about the situation. If the server is really on "vacation", then you have to wait for it to "work".
Consider switching to a different proxy service provider
If you are always experiencing this problem, it could be that your current proxy service provider is not very helpful. There are a lot of options on the market, so try another service provider. Take a look at the reviews of other users and pick one with a good reputation, you might be pleasantly surprised.
Check firewalls and security software
Sometimes the firewall or antivirus software on your computer may block your proxy connections. You can either turn them off temporarily, or add an exception in your settings to allow the traffic in question to pass through. It's like giving a friend an access control license.
Tweak the app's settings a bit
If you are experiencing problems with an application or browser, check their proxy settings. Make sure these settings match the proxy server's information, sometimes a manual adjustment can fix the problem.
Note the number of concurrent connections
Some proxy providers have a limit on the number of simultaneous connections. Just like a restaurant has limited seats, if you use the same proxy on multiple devices at the same time, you may exceed the limit. Try reducing the number of devices connected at the same time and see if the problem will be solved.
Confirm account status
If you're using a paid proxy, make sure the account isn't in arrears or disabled. Just like a subscription service, the account status is normal in order to use it.
Hopefully, these tips will help you solve the problem. If the problem still persists, don't forget to contact the technical support of your proxy service provider, who can usually provide more specialized help.