An old subdomain can remain publicly reachable after a project ends, especially when its document root or DNS record was not removed. It may contain stale software or test material. What to check Inventory subdomains, DNS records, document roots, certificates, redirects, and application status. Confirm ownership before removing a hostname that may...
Mixed content versions can result from deployment overlap, multiple document roots, cache layers, or separate application instances serving different files. What to check Compare response headers, document roots, file checksums, application release IDs, CDN cache, and server cache behavior. Test from more than one network. Recommended next step...
A domain may run with different PHP settings from another site in the same account because handlers and per-domain configuration can differ. What to check Verify the domain’s handler, PHP version, per-directory overrides, extensions, memory and upload limits, and the actual runtime reported by the application. Remove temporary diagnostics afterward....
A website may send from a default or outdated address even when the contact form shows a different sender. This can affect delivery and domain authentication. What to check Inspect application mail settings, envelope sender, From and Reply-To headers, SMTP account, and domain authentication alignment. Send a test to a controlled mailbox and review...
A site may present a valid leaf certificate but omit or serve an outdated intermediate chain, causing failures on some clients. What to check Inspect the certificate chain from multiple clients, verify the active virtual host and bundle, and check renewal and installation logs. Recommended next step Install the provider-recommended full chain and...
Different visitor errors can result from load, session, PHP worker, cache, geographic routing, or account limits. One successful browser test may not represent the full service. What to check Compare timestamps, IP or region where appropriate, request path, session state, application and web logs, PHP worker status, and resource faults. Avoid...