I removed config from Nginx and its started working, but without TLS and https
Hm, that’s strange and you might want to review your nginx config with the nginx community to be sure. It would however confirm this isn’t an n8n-specific problem but one on the reverse proxy level.
Based on my understanding there is no need for the additional location /rest/push directive to achieve a TLS/https connection from your browser. As a reference point, this (plus the certbot section added later) was my own nginx config when I was still using this web server.