SSL Certbot Certificate Expired -> Appearance of 502 Gateway Error when trying to renew

Today my site broke as the SSL Certificate expired. The certbot setup was setup to automatically renew, however that did not execute, and manually trying to renew/reinstall the certificate comes back with a 502 Gateway Error for the HTML Verification pages it works through.

Since this may be related to a NGINX Configuration error, here are my nginx files. Feel free to critique what I should change in order to optimize it.

I’ve also included some commands to certify that services are in proper working order, despite the 502 Gateway error.

Thank you for any support you can give.

sudo certbot --nginx -d -d

GitHub Gist

The only thing I can point out is that it’s working on HTTP and not HTTPS, which I can’t seem to find a specific reason for? I don’t remember needing to type in any special arguments to get it to work on HTTPS only. Additionally, I ran it with multiple arguments and some not at all to make sure that it had no effect and that it was using HTTP autonomously. I believe this might be the source of the problem, somehow.

nginx -t

xevion@ubuntu-s-1vcpu-1gb-lon1-01:/var/log$ sudo nginx -t
nginx: [warn] conflicting server name "" on, ignored
nginx: [warn] conflicting server name "" on, ignored
nginx: [warn] conflicting server name "" on [::]:80, ignored
nginx: [warn] conflicting server name "" on [::]:80, ignored
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

I’m not sure of the fix for the first couple of warns, perhaps they’re for HTTP IPv4 & IPv6, which is completely impossible with the HSTS policy in place. But business as usual, it has always been that way.

systemctl status nginx;systemctl status xeviondev

GitHub Gist

cat nginx.conf

GitHub Gist

cat /sites-available/xeviondev

GitHub Gist

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The Nginx config looks correct. Can you confirm if your AAAA record actually matches the IPv6 that you have assigned on your server?

Also what I could suggest is:

  • Check your Nginx error log:
tail -100 /var/log/nginx/error.log

This should give you some more information for further troubleshooting.

Let me know how it goes.

Regards, Bobby