net::ERR_CONNECTION_REFUSED
This error matches known, documented patterns with reliable solutions.
Quick Fix (Most Common Solution)
- Verify the server is running
- Check the URL and port number
Seeing "net::ERR_CONNECTION_REFUSED"? This error can be frustrating, but it's usually fixable. It typically affects your development workflow or system. Below you'll find clear, step-by-step solutions to resolve this issue.
What This Error Means
The browser tried to connect but the server refused the connection.
Reported across multiple operating systems and devices.
Not affiliated with browser, OS, or device manufacturers.
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Common Causes
- Server is not running
- Wrong port number
- Firewall blocking connection
How to Fix
- Verify the server is running
- Check the URL and port number
- Disable firewall temporarily to test
Last reviewed: April 2026 How we review solutions
Edge Cases
Extension, Ad Blocker, and Privacy Tool Interference With Errconnectionrefused
Errconnectionrefused triggered by browser extensions is one of the hardest categories to diagnose because it disappears when you open DevTools (some extensions pause when DevTools is open) or test in a different browser profile.
Ad blockers (uBlock Origin, AdBlock Plus) and privacy tools (Privacy Badger, Ghostery) use filter lists that block requests matching patterns associated with tracking. If your legitimate API endpoint or script URL matches a filter rule, it is silently blocked — the browser reports a network error similar to Errconnectionrefused. Test in a clean profile without any extensions using Chrome's guest mode or Firefox's Private Browsing. If the error disappears, use the extension's logger to identify which rule is blocking the request. The fix for production: rename URLs that inadvertently match tracking patterns (e.g., avoid /analytics, /track, /pixel in API paths), or proxy third-party resources through your own domain to prevent filter list matching. Firefox's Enhanced Tracking Protection similarly blocks third-party requests — check the shield icon in the address bar for blocked content.Optional follow-up
Some users ask whether saving fixes for recurring errors would be useful when the same issue appears again.
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Frequently Asked Questions
Why does this happen?
Usually the server is not running or listening on a different port.
Is this a browser issue?
No, it indicates the server refused the connection.
Related Resources
Also Known As
- Error message
- System error
- Technical error
- Error code
Common Search Variations
- "how to fix this error"
- "what does this error mean"
- "error solution"
- "troubleshooting error"
- "error fix guide"
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