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How to Fix Nginx Upstream Connection Refused on Port 80

When nginx logs show "upstream connection refused" while connecting to port 80, it means ...

Fix Git SSL Certificate Error: Unable to Get Local Issuer Certificate

When cloning or pulling from a Git repository, you may see:

fatal: unable to access...

Fix ERR_NAME_NOT_RESOLVED on Windows 10
Seeing ERR_NAME_NOT_RESOLVED in Chrome on Windows 10 means your browser can'...

Fix Windows Defender Real-Time Protection Stuck Off in Windows 11
You open Windows Security, see real-time protection is off, click the toggle, and it turns back o...

Fix NET::ERR_CERT_AUTHORITY_INVALID on Windows 10
You're browsing in Chrome or Edge and see NET::ERR_CERT_AUTHORITY_INVALID. T...

How to Allow Unrelated Histories in Git Merge
If you see the error fatal: refusing to merge unrelated histories when running


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