Session Management

Keycloak session errors are the most common source of unexpected logouts. Your application works perfectly in development, then users report being logged out randomly in production. The token refresh returns invalid_grant with a cryptic error_description like “Session not active” — and the Keycloak admin console shows no obvious misconfiguration. This guide explains every Keycloak session type, how their timeouts interact, and how to fix each session error. Quick Diagnostic: Which Error Are You Seeing? error_description Jump To Session not active SSO Session Expired Token is not active Refresh Token Expired Session doesn't have required client Cache Eviction Offline session not active Offline Session Expired Client session not active Client Session Expired authentication_expired in redirect URL Authentication Session Timeout All of these appear as invalid_grant in the OAuth error response: ...