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How to Troubleshoot HTTPS (443) on the Nginx Web Server
Fri Jun 16 2023 08:28:34 GMT+0000 (Coordinated Universal Time)
cliyb5kvr000t08l3h3yphprh
how-to-troubleshoot-https-443-on-the-nginx-web-server
error, web-development, nginx, webserver

If you have verified that Nginx is correctly configured to listen on port 443 and have allowed incoming connections to port 443 through the firewall, but are still unable to connect to the server on port 443, there may be other issues to consider.

  1. Check Nginx error logs: Nginx logs errors in the /var/log/nginx/error.log file by default. Check this file for any errors that may be preventing Nginx from listening on port 443 or serving traffic.

  2. Check SSL/TLS certificates: If you are using SSL/TLS to secure traffic on port 443, make sure that your SSL/TLS certificates are correctly configured and valid. You can check the certificate using the openssl command, like so:

    openssl x509 -in /path/cert.pem -text -noout

    Replace /path/cert.pem with the path to your SSL/TLS certificate. Make sure that the certificate is not expired and that it matches the domain name that you are trying to access.

  3. Check application configuration: If you are running an application on port 443 behind Nginx, make sure that the application is correctly configured to listen on that port. Check the application logs for any errors that may be preventing it from serving traffic on port 443.

  4. Check for conflicts with other services: Make sure that no other services are running on port 443 that may be conflicting with Nginx. You can use the sudo lsof -i :443 command to check for any processes that are listening on port 443.

  5. Check DNS resolution: Make sure that the domain name you are using to access the server is correctly resolving to the server's IP address. You can use the ping or nslookup command to verify this.

If none of these steps resolve the issue, you may need to consult with a more experienced system administrator or DevOps engineer to help diagnose and resolve the problem.🤷🏻‍♂️