BUILD YOUR SKILLS
Security incidents
Practice identity failures, certificate trust, key rotation, and vulnerability response.
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Follow the order or open any challenge. Completed timed and practice attempts both count.
- 01
Sign-in returns customers to an error page
Google OAuth · Starter · 15 min · Free
- 02
New sessions fail after identity key rotation
Auth0 · Intermediate · 1 hr · Free
- 03
The midnight expiry
NGINX · Intermediate · 5 min · Free
- 04
Some devices reject an otherwise valid certificate
NGINX · Intermediate · 1 hr · Individual / Team
- 05
New client certificates stop being trusted
NGINX mTLS · Advanced · 4 hr · Individual / Team
- 06
CVE-2024-6387: OpenSSH remediation
OpenSSH · Advanced · 8 hr · Individual / Team