[[_saml-errors]] === {project_name} specific errors {project_name} server can send an error to the client application in the SAML response, which may contain a SAML status such as: [source,xml] ---- authentication_expired ---- {project_name} sends this error when a user is authenticated and has an SSO session, but the authentication session expired in the current browser tab and hence {project_name} server cannot automatically do SSO re-authentication of the user and redirect back to client with successful response. When a client application receives this type of error, it is ideal to retry authentication immediately and send a new SAML request to the {project_name} server, which should typically always authenticate the user due to the SSO session and redirect back. More details in the link:{adminguide_link}#_authentication-sessions[{adminguide_name}].