Free servers may not be stable. If you are using free servers, we would suggest you try VIP servers with 7-day trial subscription inside X-VPN.
You may also check the following tips:
1. Retry after a while, because we keep updating IP addresses, it may start to work anytime.
2. Try every protocol to see which works for you now. We suggest you start with protocol D.
3. Change to different servers, we would suggest you try the CF Line and Ultimate Line servers first.