Community Tip - Fixing Error 501: Not implemented

Try the suggestions in this Community Tip to help you fix “Error 501: Not implemented”.

An Error 501: Not implemented happens when your origin server returns that error to Cloudflare. Contact your hosting provider and have them review your server logs to investigate why your server is returning that error.

Quick Fix Ideas

  1. The error may be related to chunk size. For files larger than 5 MB, the minimum chunk size is 5 MB; for files smaller than 5 MB, you must upload the file in one chunk. We don’t allow you to upload a small file in multiple pieces.

  2. If you are seeing this error when using Python, make sure everything in your Python enviroment is installed correctly and perform a re-install if necessary.

  3. This 501 error is received when the server does not support the facility required. This is a specific error caused by your origin server configuration. A 501 error is not something you can fix, but rather will require a fix by the web server administrator who manages the website and server you are trying to access.

  4. If you are seeing this error when making a database call, check to see what address your website is using to communicate with the database. It should be set to the localhost address, If this is set to the origin address, it won’t work correctly.

  5. Failing the above, contact Cloudflare Customer Support as indicated below and include time stamped log files and indicate what commands are resulting in the error. If this is happening on file upload, include a copy of the file.

Background Resources
Help Center

Research The Issue

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, sample files, command that triggers the error, 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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