Spn for scom 20163/11/2024 *ĭuplicate UPN values break synchronization between on-premises AD and Office 365. There is no in-box method to block the addition of a duplicate SPN or UPN. Backgroundĭuplicate Service Principal Names (SPN) commonly occur and result in authentication failures and may lead to excessive LSASS CPU utilization. This includes if the restoration or reanimation of a deleted object or the renaming of an object would result in a duplicate. ![]() Overviewĭomain Controllers running Windows Server 2012 R2 block the creation of duplicate service principal names (SPN) and user principal names (UPN). However, it has not undergone the same editing passes, so some of the language may seem less polished than what is typically found on TechNet. ![]() This content is written by a Microsoft customer support engineer, and is intended for experienced administrators and systems architects who are looking for deeper technical explanations of features and solutions in Windows Server 2012 R2 than topics on TechNet usually provide.
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