Have you ever set up a Let’s Encrypt SSL certificate for your nginx web server and tested that your API is working, but then later found out that your API does not work for your integrating 3rd party clients? You may be experiencing the “Unable to get local issuer certificate” issue.

But how do you figure out if you are having the same issue? How do you fix it? Here’s how.

If you are are attempting to connect to your AWS EC2 instance (or another running container) for the first time, via SSH, you might encounter an error trying to connect to it using your private key (PEM) file. Here’s a quick fix to that “WARNING: UNPROTECTED PRIVATE KEY FILE!”