Understand the symptom.
Decide without making it worse.

A checkout can fail in the browser, session, gateway or at order creation. Here is how to find the failing layer with the tools WooCommerce gives you.

Customers paid but the order never progressed. The gateway callback is usually where it broke. Here is how to find it and reconcile safely.

Resets, order confirmations and form notifications vanish. The cause is almost always how the mail is sent. Here is the durable SMTP fix.

Enquiries stop arriving and nothing looks broken. Separate a form that fails to submit from one that submits but never delivers — here is how.

An update is a strong lead, not a verdict. Work this order to restore service without destroying the evidence you need.

A 403 means the server understood the request and refused it. Permissions, security rules and ownership are the usual reasons. Here is the safe order.

The home page loads but every other URL is a 404. The rewrite rules did not survive the move — and the fix is usually one click plus a check.

The padlock disappears because some resources still load over HTTP. Fix the stored references instead of forcing them with a plugin.

A site that was fast last week and crawls today has a specific cause. Measure where the time goes before installing another optimisation plugin.

“Deactivate everything” is the standard advice and the riskiest step on a live site. Here is how to isolate a conflict without losing sales or evidence.

A 503 means the server is temporarily unable to handle the request. It is usually resource exhaustion, a stuck maintenance state or a fatal error under load.

A 504 means a request took longer than the server allows and was cut off. The fix is finding the slow operation, not just raising the timeout.