From synay.net.

Running the following fixed it for me (replace wlan0 with your network interface):

sudo ip addr flush dev wlan0

And with that, I was off to the races.

The solution:

sudo chown -R mongodb:mongodb /var/lib/mongodb/*

The solution for nginx:

server {
  ...
  proxy_buffer_size          128k;
  proxy_buffers              4 256k;
}

Overview

Wasya Co consulted for Sturfee in 2016.

Sturfee is an engineering-heavy small startup team developing products in AI space. As data scientists and scientists, the team was is knowledgable about AI and ML, however they lack experience in software development, and knowledge of best practices. Sturfee reached out to me to setup process for building their software, managing environments, codebases and versions, and implement an agile development cycle.