504 errors 2

I’m still getting error 504, and this isn’t a recently added zone record. Things were working fine this morning and everything seems to be in order on the local server, DNS resolution through Cloudflare for the Subdomains results in Error 504.

I’m using Nginx proxy manager for reverse proxy and the error logs state, “upstream connection timed out”

Any suggestions on how to go about troubleshooting this?