I just got this error while writing a post.
I use self-hosted ghost.
It had never happened to me before.
What is it due to?
503 is a server-side error.
How do you have Ghost deployed? Do you have an additional reverse proxy or do you just port forward all traffic to your NGINX/Ghost server?
Are you a heavy traffic site? Do other requests to the site return the same error (i.e. visiting a page on your actual blog)?
I know that error 503 is a server side error, the strange thing is that I haven’t changed any configuration in a long time.
I use Ghost with the default installation, I only added cloudflare and another similar service.
The error probably came from one of these services.
By connecting to the front end I was viewing one of the cloudflare error pages
The error lasted a few minutes.