Error: Could not connect to localhost:11501. Is the server running?
Restart your application script ( npm run , docker-compose up , etc.). Finding the Process (Quick Commands)
If you have a frontend on localhost:3000 trying to fetch from localhost:11501 , browsers may block it due to CORS unless the server on 11501 includes appropriate CORS headers. localhost11501 link
: Type http://localhost:11501/ manually into the address bar. Avoid simply typing localhost11501 , as search engines will treat it as a search query rather than a destination.
: If the hostname resolution fails, bypass it by typing the direct loopback IP: http://127.0.0 . Troubleshooting Connection Failures Error: Could not connect to localhost:11501
As an absolute last resort for testing purposes only, try temporarily disabling your system's firewall to see if it resolves the issue. If it does, do not leave your firewall disabled. Instead, follow the instructions above to create a specific "allow" rule for port 11501.
The primary use cases for localhost are in development and testing. Finding the Process (Quick Commands) If you have
If the link doesn’t work
A firewall or antivirus is blocking the loopback interface. Solution:
Some database management tools or administrative GUIs spin up a web interface on a custom port to allow the user to manage data locally.