Can you help with this issue? It’s similar but different. Here’s my error log:
2018/11/26 17:25:54 [error] 6#6: *5 upstream prematurely closed connection while reading response header from upstream, client: 172.18.0.3, server: starter.local, request: "POST /wp-cron.php?doing_wp_cron=1543253153.3822660446166992187500 HTTP/1.1", upstream: "http://192.168.95.100:4000/wp-cron.php?doing_wp_cron=1543253153.3822660446166992187500", host: "starter.local", referrer: "http://starter.local/wp-cron.php?doing_wp_cron=1543253153.3822660446166992187500"