The crash typically occurs every 24 hours after the FE server restarts.
This issue can occur if the EnableTCP parameter is used together with the New-CsTrustedApplication cmdlet. This parameter tells Lync that the trusted application will use TCP. Use this parameter only if the trusted application is not a Microsoft Unified Communications Managed API (UCMA) application. This is because UCMA applications support only the mutual Transport Layer Security (MTLS) protocol. If you don't specify the Force parameter together with the EnableTCP parameter, you receive a confirmation prompt before the new trusted application is created.
Article ID: 3141114 - Last Review: 18 Mar 2016 - Revision: 1