Azure AD Sign-in Error 81001

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The Who, Where and When information is very important for an administrator to have complete knowledge of all activities that occur on their Active Directory. This helps them identify any desired / undesired activity happening. ADAudit Plus assists an administrator with this information in the form of reports. In real-time, ensure critical resources in the network like the Domain Controllers are audited, monitored and reported with the entire information on AD objects - Users, Groups, GPO, Computer, OU, DNS, AD Schema and Configuration changes with 200+ detailed event specific GUI reports and email alerts.

Account Management » Azure AD Sign-in Error 81001

Error 81001 - User's Kerberos ticket is too large. This can happen if the user is in too many groups and thus the Kerberos ticket contains too many group memberships. Reduce the user's group memberships and try again.

About Azure Activity sign-in activity reports:

Azure Active Directory's reporting tool generates 'Sign-in activity' reports that give you insights on who has performed the tasks that are enlisted in the Audit logs.

  • All Sign-in activity reports can be found under the Activity section of Azure Active Directory.
  • The default list view of Audit logs can be customized by adding additional fields.
  • The reports can also be filtered to let you view only the activities that are relevant. 
  • Here is an example of how a sign-in activity report looks like:

    azure-ad-sign-in-error-code-81001

Error description:

Authentication failed because the user's Kerberos ticket is too large. This can happen if the user is in too many groups and thus the Kerberos ticket contains too many group memberships. Reduce the user's group memberships and try again.

Auditing Azure AD environments with ADAudit Plus:

ADAudit Plus offers change monitoring for your Azure AD environment with the following features:

  • Correlated view across hybrid environments
  • Real-time alerts
  • Schedulable reports
  • Autonomous change remediation
  • Comprehensive search
  • Out-of-the-box compliance reports

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