My websites kept receiving a “Error 521: Web server is down” emails.
I sent these issues to my web host provider. Here is the chat transcript from my web host provider:
"The issue in this case was with railgun failing, which appears to have made sites using it, not fully function, showing the web service is down.
The logs don’t show why the service failed, but the process seem to be in a unresponsive state. I’ve corrected this issue and the sites should all function normally again.
I took a look again and it appears that although railgun was running, these errors did not go away even when I restarted railgun. I tried disabling the firewall as well. The only way I was able to get the errors to go away was to stop+disable the railgun service.
There are only two options here:
- We can leave Railgun disabled
- You will have to request additional information from Cloudflare, as to why when railgun is running, the site does not load and appears to think the web server is down, with the error not going away until railgun is stopped or in some cases restarted."
What do I do? How do we fix this issue?