Chrome, when it cannot reach the proxy at all.
ERR_PROXY_CONNECTION_FAILED
Chrome could not establish a connection to the proxy host — before any question of credentials.
A proxy does not fix this. The proxy was never reached. Fix connectivity before looking at anything on the target side.
Why it happens
A typo in the hostname, or a DNS failure resolving it.
The port is closed or blocked by a local firewall or corporate network.
A stale proxy setting left in the OS or an extension after the proxy changed.
How to fix it
- Resolve the host and open the port manually — nc -vz host port answers this in a second.
- Check for an OS-level or extension proxy setting overriding what you think is configured.
Resolve the host and test the portReturns the resolved IP and whether the port answers.
FAQ
What does ERR_PROXY_CONNECTION_FAILED mean?›
Chrome could not establish a connection to the proxy host — before any question of credentials. Chrome, when it cannot reach the proxy at all.
Why am I getting ERR_PROXY_CONNECTION_FAILED?›
A typo in the hostname, or a DNS failure resolving it. The port is closed or blocked by a local firewall or corporate network. A stale proxy setting left in the OS or an extension after the proxy changed.
How do I fix ERR_PROXY_CONNECTION_FAILED?›
Resolve the host and open the port manually — nc -vz host port answers this in a second. Check for an OS-level or extension proxy setting overriding what you think is configured.
Will a proxy fix ERR_PROXY_CONNECTION_FAILED?›
The proxy was never reached. Fix connectivity before looking at anything on the target side.