Fixing 127.0.0.1 Connection Refused
127.0.0.1 is the standard IP address for the loopback network interface. Connection failures here often point to deeper system configuration issues.
1. Missing Localhost Mapping
Your computer needs to know that "localhost" points to "127.0.0.1". Check your hosts file.
Windows (Run Notepad as Admin):C:\Windows\System32\drivers\etc\hosts
# Ensure this line exists:
127.0.0.1 localhostsudo nano /etc/hosts
# Ensure this line exists:
127.0.0.1 localhost2. IPv4 vs IPv6
Modern systems also use ::1 for the IPv6 loopback. If 127.0.0.1 fails, try using [::1]:3000 in your browser to see if your server is listening on IPv6 only.
