Login Page Monitoring

The login page is your application's front door. When it goes down, no user can access the service. No workaround possible, no backup page - it's total lockout. And unlike other pages, a login outage immediately generates a flood of support tickets because users literally cannot do anything else.

Login pages are particularly vulnerable because they depend on many components: database to verify credentials, session system, OAuth provider if you use SSO, captcha system for security. Any of these failing makes login impossible. MoniTao lets you proactively monitor your login page and be alerted before your users are.

Why the login page is critical

A login page outage has immediate and severe consequences:

• Total lockout: No user can access your service. 100% of your base is impacted, not just a feature.
• Support explosion: Users contact support immediately. Tickets pile up, phone rings, social media buzzes.
• Loss of trust: Users doubt your service reliability. For a SaaS, it's a major red flag.
• Revenue impact: Users who can't log in can't buy, use, renew. Every minute counts.

What to monitor on your login page?

Effective login page monitoring covers several aspects:

• Page availability: Does the login page load correctly? Does it return a 200 code?
• Form presence: Is the login form present? Are email/password fields and login button visible?
• Response time: A slow login page frustrates users and may indicate a database problem.
• Third-party dependencies: If you use SSO (Google, Microsoft, Auth0), are these services available?
• Session system: Redis, Memcached or session database - are these components functional?

Common login page failures

Login failures have varied but recurring causes:

• Database unreachable: DB is down, saturated or credentials changed. Impossible to verify identifiers.
• Session problem: Redis down, session files saturated, incorrect permissions on sessions folder.
• SSO/OAuth failing: OAuth provider is down, token expired, callback URLs incorrect.
• Blocking captcha: reCAPTCHA or hCaptcha doesn't load, blocking form submission.

How MoniTao monitors your login page

MoniTao offers several approaches to monitor your authentication:

• HTTP monitoring: Monitor login URL. Verify it returns 200 code and loads quickly.
• Content verification: Configure text presence check (e.g., "Password", "Sign in") to detect application errors.
• Dedicated healthcheck endpoint: Create a /health/auth endpoint that checks DB connection, Redis, and SSO dependencies. Monitor this endpoint.
• Multi-location: Check from multiple geographic regions to detect CDN or DNS issues.

Setting up monitoring

Configure login page monitoring in a few steps:

1. Create a monitor for /login: Login URL, 1-minute frequency (critical), content verification enabled.
2. Add a healthcheck endpoint: Create /api/health/auth that checks DB + sessions + SSO. Monitor separately.
3. Configure priority alerts: Enable SMS alerts for login page. It's critical enough to justify immediate notification.
4. Monitor dependencies: If using Auth0, Firebase Auth, or other provider, monitor their status pages or APIs.

Best practices

• Always have a fallback login system (classic login/password) even if you mainly use SSO.
• Create a status page that tells users if login service is operational.
• Log login errors with enough detail to diagnose quickly.
• Regularly test the complete login flow, not just page display.
• Prepare communication procedures for prolonged authentication system outages.

FAQ - Login page monitoring

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