SfB Server – Prerequisite installation failed: SqlInstanceRtcLocal

Recently while adding a new Front End Server to the existing Skype for Business Enterprise Pool we got the following message on SfB Deployment Wizard Step 1: Prerequisite installation failed: Prerequisite installation failed: SqlInstanceRtcLocal For more information, check your SQL Server log files. Log files are in the folder C:\Program Files\Microsoft SQL Server\MSSQL*.RtcLocal\MSSQL\Log, where the *… Read more

SfB Server 2015: Event 57005, LS User Store Sync Agent – Could not find stored procedure XdsQueryCriticalDocumentSignatures

While updating our SfB Server 2015 lab, we notice that a recently updated Front End server had multiple errors and warnings in the Event Viewer: Log Name: Lync Server Source: LS User Store Sync Agent Date: 12/09/2017 21:54:33 Event ID: 57005 Task Category: (1061) Level: Error Keywords: Classic User: N/A Computer: sfbfe03.recore.lab Description: Error encountered… Read more

Lync/SfB Server: Event 41026, LS Data MCU after May 2017 .NET Framework update

Update 2017/06/28 – In Workaround #1 we also need to request new Front End certificates with Client and Server authentication in the EKU. Recently we notice that Lync Server 2010/2013 and Skype for Business Server 2015 Front Ends were generating the Events 41025 and immediately after the Event 41026: Log Name: Lync Server Source: LS… Read more

Lync Server: Event 41029 LS Data MCU – No connectivity with the Lync Web App

In a recent support case we were working on an issue where sometimes the users couldn’t use the Lync Web App. The troubleshooting started in the Event Viewer > Lync Server, we notice that we had a few errors: Log Name: Lync Server Source: LS Data MCU Date: 01/03/2017 15:00:43 Event ID: 41029 Task Category: (1018) Level:… Read more

Lync Server 2013: Event 14497,14517 LS Protocol Stack

This issue dates a while back, but after Lync Server 2013 Cumulative Update 3 (5.0.8308.556 and above) the Edge Server Access Service won’t start with the Event 14497 LS Protocol Stack: One or more configuration errors were detected at startup that cannot be mitigated. Cause: There are serious problems with the server configuration that prevented… Read more

Lync Server: Event 31137,31138 LS Response Group Service

These are common warnings and usually associated with issues such as disabled AD account or user removed from Lync Server: Log Name: Lync Server Source: LS Response Group Service Date: 22/12/2014 19:32:15 Event ID: 31137 Task Category: (2001) Level: Warning Keywords: Classic User: N/A Computer: ************ Description: During the Active Directory update non-SIP enabled agents were… Read more

Lync Server 2013: Event 31007 LS Certificate Manager

It is really important to regularly check the Event Viewer for Warnings/Errors (or to use System Center Operation Manager to do it for you). In one of these checks, the following event was found: Log Name: Lync Server Source: LS Certificate Manager Date: 06/10/2014 02:29:30 Event ID: 31007 Task Category: (1016) Level: Warning Keywords: Classic… Read more

Lync Server 2013: Event 1034, LS File Transfer Agent Service

Last week a customer asked me to check his Lync Server 2013. Everything was working, but there were some Event 1034, LS File Transfer Agent Service errors in the Event Viewer: Event 1034, LS File Transfer Agent Service Microsoft Lync Server 2013, File Transfer Agent service encountered an error while accessing a file share and will… Read more