Run your site locally with HTTPS using mkcert (recommended) To use HTTPS with your local development site and access https://local... How do I properly upload a localhost website online?
This is a common error that can occur when you attempt to start a new server, but the port is already occupied by another process.
Have additional troubleshooting tips for https localhost 11501 ? Share your experience in the developer forums—because localhost security is a journey, not a destination.
from flask import Flask app = Flask(__name__) @app.route( " / " ) def feature (): return " New Local Feature " if __name__ == " __main__ " : app.run(port= 11501 , ssl_context= ' adhoc ' ) Use code with caution. Copied to clipboard 3. Expose the Feature (Optional)
If your service on port 11501 is built with .NET, the framework includes built-in tools to generate and trust development certificates. Open your terminal and run: https localhost 11501 url
Are you running this service inside a or directly on your host machine?
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A: No, you cannot. No publicly trusted Certificate Authority (CA) will issue a certificate for the hostname localhost because it is a reserved, non-unique name that isn't owned by any single entity.
You will still need to or manually add a certificate exception. Run your site locally with HTTPS using mkcert
Developers often map service ports, such as 11501, to expose local applications running within Docker containers.
After completing these steps, start your server. You should be able to navigate to https://localhost:11501 in your browser and see a secure connection with a green padlock, free from any security warnings.
Run npm run dev → visit https://localhost:11501 .
This command may prompt you for your system password to install the new CA. Copied to clipboard 3
If you are developing a frontend app that communicates with a backend on port 11501, configure your vite.config.js : javascript
Understanding the components of this URL helps troubleshoot connection errors, configure development environments, and secure local applications. Anatomy of the URL
Then restart your intended dev server on its default port.
: In some regions, specific local server agents for government portals (such as the Khajane 2 system in India) utilize this port for secure local communication. Legacy Enterprise Hardware : The Cisco CSS 11501 Go to product viewer dialog for this item.