502 Bad Gateway

Anyone have any idea why I’m getting a 502 bad gateway nginx error when I hit my website keto.000webhostapp.com?

http://downforeveryoneorjustme.com/keto.000webhostapp.com
This website says my site is down.

When I try to ping the site, the request times out.

status.000webhost.com all looks good.

This all started when I tried uploading files from a different computer (through the dashboard not FTP). A mysterious .ftpquota file appeared one directory above public_html. Not sure if that has anything to do with why my site is down.

Here’s a peek at the .ftpquota file contents.
{"result":{"success":false,"error":"ftp_get(): Prohibited file name: \/.ftpquota","errorDetail":{"type":"Exception","code":2}}}

Not sure.
I get Hello World.

Okay, thank you i believe the site is back up.