@bobbyiliev:
tail -100 /var/log/nginx/error.log
shows me the following for our application after restarting mongodb :
2020/01/16 16:26:44 [error] 25305#25305: *69279 upstream prematurely closed connection while reading response header from upstream, client: 128.227.182.203, server: lims.rgportal.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:3001/", host: "lims.rgportal.com"
2020/01/16 16:28:44 [error] 25305#25305: *69279 upstream prematurely closed connection while reading response header from upstream, client: 128.227.182.203, server: lims.rgportal.com, request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:3001/favicon.ico", host: "lims.rgportal.com", referrer: "https://lims.rgportal.com/"
2020/01/16 16:29:53 [error] 25305#25305: *69298 upstream prematurely closed connection while reading response header from upstream, client: 128.227.1.38, server: lims.rgportal.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:3001/", host: "lims.rgportal.com"
2020/01/16 16:30:01 [error] 25305#25305: *69307 upstream prematurely closed connection while reading response header from upstream, client: 128.227.1.36, server: lims.rgportal.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:3001/", host: "lims.rgportal.com", referrer: "https://lims.rgportal.com/"
2020/01/16 16:30:01 [error] 25305#25305: *69298 upstream prematurely closed connection while reading response header from upstream, client: 128.227.1.38, server: lims.rgportal.com, request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:3001/favicon.ico", host: "lims.rgportal.com", referrer: "https://lims.rgportal.com/"
2020/01/16 16:30:01 [error] 25305#25305: *69307 connect() failed (111: Connection refused) while connecting to upstream, client: 128.227.1.36, server: lims.rgportal.com, request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:3001/favicon.ico", host: "lims.rgportal.com", referrer: "https://lims.rgportal.com/"