Beyond tweaking installation exits, one of the approaches is using ServiceNow's Adaptive Authentication framework to create access policies that restrict logins based on user roles, effectively whitelisting admin users while toggling the rule safely via system properties. Alternatively, if your org uses Single Sign-On (SSO), you can restrict non-admin access directly within your Identity Provider (like Azure AD or Okta) or temporarily disable SSO so non-admins can't authenticate, leaving local admin access available via the standard /side_door.do URL.
For temporary maintenance windows, administrators also commonly run a background script to flag non-admin sys_user records as inactive or locked out, enforce strict IP Access Controls to block non-admin networks, or leverage Scripted Pre-Authentication Rules to validate admin roles before issuing session tokens.
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