If your main website loads over http://localhost , but attempts to fetch data from https://localhost:11501 , the browser will block the request due to security policies. Always ensure both your frontend and backend environments match—either both use HTTP or both use HTTPS. Replicating a 2021 Development Environment Today
: Another application might be blocking the port. You can find out what is using port 11501 by running a command in your terminal: Windows (PowerShell) : netstat -ano | findstr 11501 Mac/Linux : lsof -i :11501 https localhost11501 2021
If you can clarify:
Enterprise Printing Services: Many web-based corporate tools use a local "agent" to communicate with physical printers. These agents often run on high-numbered ports like 11501 to avoid interfering with standard web traffic. If your main website loads over http://localhost ,
: https - This indicates that the URL uses the Hypertext Transfer Protocol Secure. It's a secure way to transfer data between your browser and the server. The s in https stands for secure, indicating that the data is encrypted. You can find out what is using port
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This error occurs when you try to start a server on a port that is already occupied by another process.