502 Bad Gateway Error / Nothing changed in server block?

Suddenly started getting a bad gateway error despite not changing anything in my server blocks?

Working on Ubuntu18.04 with the URL being pointed towards a shiny server.

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This might be possible because of issues at the hosting provider end. So its better to check by changing the hosting service provider.

502 Bad Gateway indicates that your server is not responding and it’s not able to get a valid response from the origin server so you have to wait for some time maybe it will get back on track otherwise read some tutorials about it, I was also facing same issues with my website then after sometime it works normally, But still if not working you can try the steps which were mention above by two respected members.

Yes, It Seems Your Web Server Is Not Able To Send The Request, Stop The Nginx Web Server And Then Keep An Eye On The Error Logs!