Notice: This website is an unofficial Microsoft Knowledge Base (hereinafter KB) archive and is intended to provide a reliable access to deleted content from Microsoft KB. All KB articles are owned by Microsoft Corporation. Read full disclaimer for more details.
View products that this article applies to.
When you use Microsoft Skype for Business clients in Windows Server 2012 R2, you may experience authentication failures.
This issue occurs because of a deadlock in Windows Local Security Authority Subsystem Service (LSASS) in Windows Server 2012 R2. The deadlock causes perceived lockup of the server in which all incoming server-to-server TLS negotiations fail and authentication requests from Skype for Business clients fail.
To fix this issue, install the July 18, 2017, rollup update (KB4025335) for Windows Server 2012 R2.
Keywords: kb, kbsurveynew, kbexpertiseInter, kbfix, kbqfe