Guides
Nginx
Guides
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What is caching? Browser, page and object caches
Caching keeps a ready-made copy of something so it does not have to be built again. The layers that make websites fast, and when…
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What is a reverse proxy?
A server that stands in front of your other servers, takes every request and decides who answers. What it does, when you need one,…
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How to get a free SSL certificate with Let’s Encrypt
Issue a trusted HTTPS certificate in one command with Certbot, redirect HTTP to HTTPS, and make sure it renews by itself.
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How to install Nginx on Ubuntu
Install Nginx, serve your first site from its own folder, and learn the three commands you will use every time you change its configuration.
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How to move a WordPress site to a new host
Copy the files and database, test on the new server before anyone else sees it, then switch DNS with the old host kept as…
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How to fix ERR_SSL_PROTOCOL_ERROR
The browser and server could not agree on a secure connection at all. Usually HTTPS is not set up on that port, or the…
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How to fix ERR_CONNECTION_REFUSED
The server answered, but nothing was listening on that port. Usually the web server is stopped, listening elsewhere, or a firewall rejects you.
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How to fix ERR_TOO_MANY_REDIRECTS
Two rules are sending visitors back and forth forever. Usually HTTP and HTTPS, or www and non-www, set differently in two places.
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How to fix 429 Too Many Requests
A rate limit was hit. Slow down if you are the visitor; if you run the site, decide whether the limit is protecting you…
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How to fix 404 Not Found errors on your site
A few 404s are normal. Sudden ones, or every page except the home page, point to a broken rewrite, a moved page or a…