Insights on Identity, Security & Keycloak
Tutorials, deep dives, and best practices from the Skycloak team.
Fixing Keycloak’s 431 ‘Request Header Fields Too Large’
Fix Keycloak HTTP 431 'Request Header Fields Too Large' errors: raise Quarkus header limits and shrink bloated tokens by trimming…
11 min read
JWKS Explained: JSON Web Key Sets and Keycloak Key Rotation
Learn what JWKS means, how to verify JWT signatures safely, and how to rotate Keycloak signing keys with overlap while…
12 min read
How to Verify a Keycloak Access Token on the Backend
Verify Keycloak access tokens on your backend: local JWT signature checks with JWKS, token introspection, claim validation, and Java, Node,…
12 min read
Keycloak ‘Token Not Active’ Clock Skew: How to Fix
Fix Keycloak 'token is not active' and 'JWT issued in the future' errors caused by clock skew: sync server time…
10 min read
Keycloak ‘Account Already Exists’ During Identity Brokering
Fix the Keycloak 'account already exists' error during social login and identity brokering: the first-login flow, account linking, and trusting…
10 min read
Keycloak Theme Not Loading: Causes and Fixes
Fix Keycloak custom themes not loading: theme caching, the themes directory and provider structure, theme selection, and Quarkus dev vs…
9 min read
Is Keycloak Overkill for a Startup?
Is Keycloak overkill for a startup? An honest look at flat pricing vs per-MAU fees, the real ops burden, and…
10 min read
Keycloak Not Sending Emails? How to Fix It
Fix Keycloak email problems: SMTP configuration, TLS/SSL ports, authentication, the 'from' address, app passwords, and testing from the admin console.
10 min read
Is Keycloak Right for Your B2B SaaS? A Decision Guide
Is Keycloak right for your B2B SaaS? An honest decision guide on multi-tenancy, enterprise SSO, SCIM, flat pricing, and the…
12 min read
Fixing Keycloak 502 Bad Gateway Errors
Fix Keycloak 502 Bad Gateway errors behind a reverse proxy: proxy headers, timeouts, health checks, hostname configuration, and startup timing…
10 min read
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