Question

error duplicate listen options for [::]:443 when trying to add a subdomain to my nginx setup

Posted June 8, 2021 1.3k views
NginxLet's EncryptUbuntu 18.04

I followed this DigitalOcean guide on how to setup Nginxon an Ubuntu 18.04 droplet. I set up my domain’s nameservers to point to Cloudflare’s and then based on what I had read previously my understanding that to add a subdomain (blog.faizanjamil.dev in this case) I could simply add a file titled (blog.faizanjamil.dev) to the /etc/nginx/sites-available (and symlink that file with /etc/nginx/sites-enabled)
Keep in mind I am using Let’s Encrypt

However when I add that file and then try to enable that site, I get the following when running sudo nginx -t

nginx: [emerg] duplicate listen options for [::]:443 in /etc/nginx/sites-enabled/faizanjamil.dev:20
nginx: configuration file /etc/nginx/nginx.conf test failed

Now the blog.faizanjamil.dev config was created by copying the faizanjamil.dev config and modifying it slightly. With the blog subdomain not included in sites-enabled nginx produced no errors in the configs.
I have tried the same procedure to create the config for the subdomain twice, no luck. I have shown the below files to a buncha people who then suggested I try a couple different things like removing the default config from sites-enabled, no luck.
So can anyone please help with this issue?
Also before I forget I intend to deploy Ghost on that blog subdomain

My nginx.conf, faizanjamil.dev config, default config, and blog.faizanjamil.dev configs are attached in the pastebin links below.

Nginx.conf
faizanjamil.dev config
default config
blog.faizanjamil.dev config

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