title: How can handle the local authentication when a SSO website is down?
body: <p>We are developing an <code>SSO</code> application using <code>IdentityServer4</code> as the authentication (not authorization) infrastructure for other (<code>client</code>) websites in our company. One of our main concerns is the failure of the SSO website. In this situation, what considerations should we consider to minimize <code>clients</code> issues?</p>
  <p>For example, we want to create a local login page in each application and ask each application to authenticate it using the <code>OTP</code> mechanism. Is this enough or are there better solutions?</p>