How to monitor your login flow and catch sign-in failures
Login is the failure with the widest blast radius. A broken checkout affects people trying to buy right now. A broken login affects every customer you have ever had, simultaneously, and produces a support queue rather than a metric.
What breaks sign-in
A certificate or token expires. An identity provider's signing key rotates, a JWT secret changes, and every session becomes invalid at once at whatever moment the clock says.
Sessions stop persisting. A cookie attribute change - SameSite, Secure, domain - means login appears to succeed and the next page shows you logged out.
SSO configuration drifts. A redirect URI, a scope, an expired secret in the identity provider.
A rate limit or firewall rule catches real users. Protection tuned against credential stuffing starts refusing legitimate customers.
Why the login page returning 200 proves nothing
Every one of those failures serves a perfectly healthy login page. The form renders, the CSS loads, the server is fast. The failure is in what happens after you submit, which no status check reaches.
The tell is usually support volume rather than monitoring - which means your customers are your alerting system, and they are slower and considerably more annoyed than software.
How SiteOps handles it
Four steps, none of which involve writing a test script.
What it does and does not do
- Use a dedicated test account, not a real customer's or an admin's. It needs only enough access to prove sign-in works.
- Credentials never reach the AI. They are encrypted at rest and injected into the browser at replay time.
- Accounts with MFA need an exception for the test account, or the journey stops at the code prompt and reports it rather than guessing.
Common questions
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