ERR_CONNECTION_REFUSED
Plain-English meaning
Browser could not open a TCP connection to host/port.
Why it happens
Target is not listening or firewall actively rejects the connection.
Common causes
- Service crashed or failed to start
- Service bound only to localhost
- Container port not published
- Security group/firewall denies inbound port
What to check first
Use curl/nc from same network path, verify listening sockets, and check container/LB port mappings.
How to fix it
Start service, bind to correct interface, expose required ports, and align DNS/LB targets with active listeners.
Example signal
net::ERR_CONNECTION_REFUSED GET https://api.example.com/health
Related links
404 · 429 · 500 · 502 · 503 · 504 · Cloudflare 522 · Nginx 499 · ERR_CONNECTION_REFUSED
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