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How to Fix Nginx 'Upstream Connection Refused' Error

When Nginx returns a 502 Bad Gateway with upstream connection refused in the error l...

Fix DNS Probe Finished NXDOMAIN on Custom DNS Server

If you see “DNS PROBE FINISHED NXDOMAIN” in Chrome or another browser while using a custom DNS se...

How to Fix Git 'index.lock' File Exists Error

When you see fatal: Unable to create 'path/.git/index.lock': File exists., G...

Fix Firefox Secure Connection Failed Error (Mozilla)

When Firefox shows 'Secure Connection Failed' and a message like MOZILLA_PKIX_ERROR_<...

Fix Git Clone Connection Timed Out on GitHub Enterprise
When you run git clone on a GitHub Enterprise repository and see connection ti...

How to Resolve Git SSL Certificate Error: Unable to Get Local Issuer If you see fatal: unable to access 'https://...': SSL certificate problem: unable t...

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