In 2021, mkcert became the gold standard for local HTTPS.

Here’s a blog post tailored to your request. Since “https localhost:11501” with a 2021 context likely refers to running a local secure web server (e.g., for development, testing, or a specific tool), I’ve written a general, informative post that explains what this means, why HTTPS on localhost matters, and how to troubleshoot common issues.

Because the connection is local, the SSL certificate is usually self-signed by your development environment rather than verified by a public authority like DigiCert.

Run with:

If you're having trouble accessing a service on https://localhost:11501 , this systematic approach can help identify the issue.

If localhost isn't resolving, try using the literal IP address instead. For example, access http://127.0.0.1:11501 . This can resolve issues where your system is resolving localhost to the IPv6 address ::1 while your server is only listening on IPv4 127.0.0.1 .

To understand why this specific address is used, it helps to break it down into its core technological components:

docker run -p 11501:443 my-app:2021

Your browser does not trust the self-signed certificate the local server is using.

Here are some concrete scenarios where you might encounter this specific string:

node server.js

The URL begins with https (Hypertext Transfer Protocol Secure). This indicates that the communication between the browser and the server is encrypted.

Below is a detailed article explaining what this address means, why you might encounter it, how to troubleshoot common errors, and how to work with it in 2021 contexts (as the year in the URL suggests).

In the late hours of a chilly November night in 2021, sat hunched over his glowing monitor, the only light in his cramped apartment. He was a junior developer on the verge of a breakthrough—or a breakdown.