Knowledge base for software setup, errors, and daily tool work.

How to Fix Cloudflare 521 Error (Port 443 Blocked)

When you see a Cloudflare 521 error, it means Cloudflare’s servers cannot connect to your origin ...

How to Set Timeout for Python Requests

When using the Python requests library, a common issue is that a request can hang in...

Fix npm install Permission Denied on Shared Hosting

How to Fix Cloudflare Origin Certificate Validation Failed

If you see a "validation failed" error when setting up or using a Cloudflare Origin Certi...

Fix Nginx 502 Bad Gateway in Docker Containers

An Nginx 502 Bad Gateway error when proxying to a Docker container usually means Nginx cannot rea...

Fix ERR_CERT_AUTHORITY_INVALID on Localhost

When testing a local web app, you may see ERR_CERT_AUTHORITY_INVALID in Chrome or si...