Django/Nginx/Gunicorn "unknown errors" in nginx logs

Trying to deploy a Django/Nginx/Gunicorn project, I cannot resolve a 502 Bad Gateway issue. Looking at nginx logs, I see “104: unknown error” and “111: unknown error”-- which seems kind of uninformative. How do I debug this further?

p.s. the most recent error recorded goes like this: "*28 connect() to unix:/home/username/gunicorn.socket failed (2: No such file or directory) while connecting to upstream, client: IP_ADDRESS, server: _, request: “GET / HTTP/1.1”, upstream: “http://unix:/home/username/gunicorn.socket:/”, host: “MY_DROPLET_IP_ADDRESS:80” "

I can post some details of my gunicorn.service and nginx configuration if this isn’t enough… been fighting with this for hours, coming from Apache2 and WSGI it’s a lot more moving pieces.