[Solved] Error 520: Web Server Is Returning an Unknown Error - MiniTool Partition Wizard

HomePartition Magic[Solved] Error 520: Web Server Is Returning an Unknown Error By Charlotte | Follow | Last Updated September 6, 2023 When using Cloudflare with your (staging) website, do you receive "Error 520: web server returns an unknown error"? If you do, you come to the right place. In this post, MiniTool Partition Wizard provides the reasons and solutions for this error.On This Page :Causes of Error 520Solution 1. Troubleshooting Error 520Solution 2. Restart Web ServerSolution 3. Remove PluginsSolution 4. Check Headers and CookiesSolution 5. Configure DNS ProperlySolution 6. Contact Cloudflare SupportBottom LineCauses of Error 520You can receive “Error 520: Web server is returning an unknown error” when the origin server returns an empty, unknown, or unexpected response to Cloudflare.What are the reasons for Error 520 Cloudflare? There are some possible reasons:Origin web server application crashes.Cloudflare IPs are not allowed at your origin.The origin web server TCP idle tim...