Step 1. Press win+R

Step 2. Input "cmd", then press Enter

Step 3. Copy the test command on our site and paste it in the Windows command, then press Enter.

Step 4. This test result shows that you can successfully connect to the proxy.

Step 5. This insufficient flow error report prompts that your account has reached the flow limit.

This is because you have set a traffic usage limit for the sub-account. Please increase the upper limit or set it to 0 (0 defaults to no upper limit.)