Community Tip - Fixing Error 505: Version not supported

Error
Try the suggestions in this Community Tip to help you fix “Error 505: Version not supported”.

Background
An Error 505: Version not supported happens when the server does not support, or refuses to support, the major HTTP version that was used in the request message.

Quick Fix Ideas

  1. If you see this error in your Web browser, try a newer version or switch to a modern browser to see if the error goes away.

  2. The error message should indicate what protocols are supported by your origin server, review those protocols to troubleshoot the error. The error may specifically indicate what program name does not support the protocol. If so, review that information to troubleshoot the error.

  3. If you still see this error in your Web browser, upgrade your orgin Web server software to support the major version of the http protocol you require.

Background Resources
Help Center
YouTube

Research The Issue
Community
Google

If You Need More Help
This community of other Cloudflare users may be able to assist you, if not, login to Cloudflare and then contact Cloudflare Support. When you contact support, make sure to include as much of this information as possible: time stamped log files from your origin server, domain name, error messages, screen shots, and HAR file(s). Indicate which of the Quick Fix Ideas you’ve tried in order to help Customer Support help you.

Expert Comments Appreciated
This Community Tip will remain open for input from Community experts and those familiar with this issue. We really appreciate comments that start with words like: “The three things I always try”, or “Do this first” or “In my experience”.

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