Front End server of Skype for Business Server 2015 crashes upon restart Content provided by Microsoft Applies to: Skype for Business Server 2015 Select Product Version All Products Symptoms Assume that you apply a normalization rule to the address book, and then restart the Front End server of Microsoft Skype for Business Server 2015. In this situation, the RTCSrv.exe service crashes. Resolution To fix this issue, install the November 2016 cumulative update 6.0.9319.272 for Skype for Business Server 2015. Last Updated: Nov 7, 2016 Did this solve your problem? Yes No Tell us what we can do to improve the article Submit Thanks! Your feedback will help us improve the support experience.