Keycloak single sign-on duplicate login problem: How to solve session timeout and login failure?

Keycloak single sign-on: Solve the problem of repeated login

This article analyzes the problem of repeated login in Keycloak single sign-in. This problem is manifested in the user's user name, password and verification code, and the login information is reset and you need to enter it again before you can log in. This problem mainly occurs in two scenarios: the login page has not been operated for a long time, or the user returns to the login page after the Keycloak system is restarted.

Problem background: The front-end uses Vue3 and TypeScript, and the back-end uses Keycloak to achieve single sign-on. The developer suspects that the problem is related to the expiration of Keycloak information.

The following key factors need to be considered:

• Session timeout settings: Keycloak's default session timeout may be too short. You need to check the Keycloak session timeout configuration and adjust it according to actual needs to extend the timeout time or improve the session management mechanism.
• Browser cache conflict: Old Keycloak information cached by the browser may cause conflict. It is recommended to clear the browser cache (including cookies and local storage) and try to log in again.
• Keycloak server configuration issues: Keycloak server configuration (security settings or plug-in) may conflict with session management. Check the Keycloak server logs for error messages, and confirm that the configuration is compatible with the front-end application.
• Front-end code logic error: Front-end code may have defects in handling Keycloak login response. For example, the token or session information returned by Keycloak is not properly processed. The front-end code needs to be carefully checked to ensure that the Keycloak response is processed correctly and tokens are stored and used safely.
• Session recovery mechanism after Keycloak restart: Session information may be lost after Keycloak restart. Make sure Keycloak's session storage mechanism (database configuration or other persistent storage) can correctly restore the session after restart.

Developers should check the above factors one by one, adjust and repair them according to actual conditions. By checking Keycloak configuration, front-end code and browser cache, we gradually narrow the scope of the problem and finally solve the problem of repeated login.

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