Vercel deployment failed
Open the build logs on the deployment's page: the first error line is the cause. Usually a build command failing, a missing environment variable, or bad config.
Vercel error
Vercel's error page shows a code like FUNCTION_INVOCATION_FAILED or DEPLOYMENT_NOT_FOUND. It says whether your function crashed, timed out, or is missing.
Netlify build failed
Read the deploy log from the first error. Usual causes: the build command, a missing environment variable, a different Node version, or the repo link.
Netlify not working
Check Netlify's status page, then whether the latest deploy succeeded. "Page not found" on refresh usually means a single-page app is missing its rewrite rule.
Heroku error
Heroku logs an error code with every failure: H10 app crashed, H12 request timeout, H14 no web dynos, R14 memory exceeded. Run heroku logs to see which.
AWS error
Check the AWS Health Dashboard first, then the service that failed. Most AWS outages for one site are security group rules, permissions, or a resource limit.
GoDaddy website down
Check whether it's the domain, the hosting, or the site itself. Error codes point to hosting or code; "can't be reached" points to the domain or DNS.
Is DigitalOcean down?
Check DigitalOcean's status page. If it's fine, your Droplet is the problem: use the Recovery Console to get in even when the network or SSH is down.
Bluehost error
Read the error first. On Bluehost shared hosting, most errors are a WordPress plugin, a broken .htaccess file, account resource limits, or the domain's DNS.
SiteGround error
SiteGround's own guide: check if the site loads from elsewhere, then read the error. 403 is permissions or .htaccess, 404 a missing file, 500 configuration.
Is Hostinger down?
Check Hostinger's status page. If Hostinger is fine, check your plan's resource usage, your domain's DNS, and your site's own errors, in that order.
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