Site health
502 Bad Gateway error: what it means and how to fix it
A 502 means a gateway or proxy got an invalid response from the server behind it. Find which server sent it, then follow one failed request through the logs.
Articles on site health
Availability, certificates, domains and the breakages a plain uptime check walks past.
Site health
SSL certificate: why you need one, how to check it and avoid HTTPS errors
Check the certificate where visitors meet it, on the public address. The file in your hosting panel and the certificate the server actually serves can differ.
Site health
Website loading speed: how to check it and what to fix first
Start with the page that matters and the stage where time is lost. The metrics tell you whether the server is slow to answer or the browser is slow to show.
Check your own site
The free tools these articles lean on. Each looks at one page and says what it found and what it could not see.
- GA4 checkerWhich GA4 streams a page uses and what it sends
- Google Tag Manager checkerGTM containers on a page and what the published one sets up
- Consent MatrixCookie consent checker: what tags do before and after consent
- Conversion tracking checkerWhich tracking one page carries: Google Ads, GA4, Meta