Proxy troubleshooting
Ranked causes, ordered diagnostics, and a verified remedy for firefox: the proxy server is refusing connections - ending with a final connection check.
Quick answer
Fix: Firefox says the proxy server is refusing connections. Confirm endpoint values, test with curl through the endpoint, apply the matched remedy, then re-verify the exit IP is your assigned endpoint.
Ranked causes, ordered diagnostics, and a verified remedy for firefox: the proxy server is refusing connections - ending with a final connection check.
Fix: Firefox says the proxy server is refusing connections. Confirm endpoint values, test with curl through the endpoint, apply the matched remedy, then re-verify the exit IP is your assigned endpoint.
Likely causes
Verified remedy
Open Settings > Network Settings, re-enter host and port, and disable 'Use system proxy settings' during the test.
Likely causes
Verified remedy
Restart Firefox, then test the endpoint with curl from the same network.
The action completes and the exit IP matches the endpoint.
If curl also fails, the endpoint is unhealthy: swap to a spare.
Facts last reviewed 2026-09-01.
Keep one profile on one static endpoint, verify exit IPs daily, and rotate credentials on a documented schedule.
Work the diagnosis tree top to bottom, confirm endpoint values, test with curl through the endpoint, then run the final connection check.
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