Unable to Connect

The remote host actively refused the TCP connection, typically because no service is listening on the requested port or a firewall rejected it outright.

References

searchfox.org/mozilla-central/source/xpcom/base/ErrorList.py
support.mozilla.org/en-US/kb/what-do-network-error-messages-mean

In this namespace

← previous NS_BINDING_ABORTED Load Aborted next → NS_ERROR_CORRUPTED_CONTENT Content Encoding Error

MOZILLA_PKIX_ERROR_MITM_DETECTED NS_BINDING_ABORTED NS_ERROR_CONNECTION_REFUSED NS_ERROR_CORRUPTED_CONTENT NS_ERROR_DOCUMENT_NOT_CACHED NS_ERROR_MALFORMED_URI NS_ERROR_NET_INTERRUPT NS_ERROR_NET_RESET