It will be necessary to temporary suspend single sign-on operation if the Systemwalker Single Sign-On Server becomes unusable for some reason (e.g., the server stopping due to a fault or failure, server stopped for regular maintenance)
Refer to Section 4.5, "What to Do If the Systemwalker Single Sign-On Server Has Stopped" in the Systemwalker User's Guide - Systemwalker User Management and Single Sign-On for details.