Community Tip - Fixing Error 527: Railgun Listener to Origin

Try the suggestions in this Community Tip to help you fix Error 527: Railgun Listener to Origin.

Error 527: Railgun Listener to Origin indicates an interruption or failure in the WAN connection from Railgun’s sender at Cloudflare’s edge and the Railgun Listener (rg-listener) at your origin server. When this happens, you’ll see “Error 527: Railgun Listener to Origin”.

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Quick Fix Ideas

  1. If you are a site visitor, report the problem to the site owner. Neither this Community nor Cloudflare Support can assist you.

  2. If you are using Railgun and are the customer of a Cloudflare Hosting Partner, you should contact them about this. If you are running your own Railgun, then you should contact Cloudflare Customer Support as indicated below.

  3. It may be required to increase logging for Railgun in order to troubleshoot further, and see what rg-listener is reporting.

  4. Common causes for Error: 527 include Connection Timeouts, LAN Timeout is Exceeded, Connection Refusals, and TLS/SSL Related Errors. Consult the Lite Reading section of this Community Tip to see the specfic errors each of these issues will show in your Railgun Logs. From the logs, evaluate the state of Railgun Listener around the time this error occurred.

Lite Reading

Background Resources
Help Center

Research The Issue

If You Need More Help
This community of other Cloudflare users may be able to assist you, login to Cloudflare and post your question to the Community. When you post on the Community make sure to include as much of this information as possible: the specific error message you are seeing, the URLs this is happening on, screen shot of the error, and the steps to reproduce the error. Please indicate what troubleshooting steps you’ve tried in order to help us help you.

Expert Comments Appreciated
This Community Tip will remain open for a week of input from Community experts and those familiar with this issue. We really appreciate comments like: “What are the three things to always try”, or “Do this first” or “In my experience”.

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