Session timeout: your session has expired

User session exceeded the configured idle timeout limit due to inactivity, which is controlled by the 'glide.ui.session_timeout' system property. (high likelihood)

User session exceeded the absolute session timeout limit regardless of activity, controlled by the 'glide.authenticate.sso.max_session_timeout' system property. (high likelihood)

Service account or integration user token expired during API calls or scheduled operations, particularly when OAuth token expiry is set too low. (medium likelihood)

Browser-stored session cookies were cleared, corrupted, or expired independently of ServiceNow session management settings. (medium likelihood)

System maintenance, instance restart, or node switching in a clustered environment invalidated active sessions unexpectedly. (low likelihood)

Step 1: Navigate to System Properties > Session Management and check the current values for 'glide.ui.session_timeout' (idle timeout) and 'glide.authenticate.sso.max_session_timeout' (absolute timeout).

Step 2: Review the System Log at System Diagnostics > Log > Application Log to identify if the timeout occurred during specific operations or affects multiple users.

Step 3: If affecting service accounts, check OAuth Application Registry at System OAuth > Application Registry to verify token expiration settings and refresh token configuration.

Step 4: For frequent user timeouts, consider increasing the idle timeout value in 'glide.ui.session_timeout' from the default 30 minutes to a more appropriate duration for your organization.

Step 5: Verify if SSO integration is causing premature session termination by checking Identity Provider session limits and SAML assertion validity periods.

Step 6: Clear browser cache and cookies for the ServiceNow instance, then test login again to rule out client-side session storage issues.

Step 7: Monitor active sessions using System Diagnostics > Sessions Active to identify patterns in session termination and validate that timeout adjustments are working correctly.