Sonus SBA Lync 2013 FrontEnd service does not start

Some issue while deploying SBA on Sonus 

Log Name:      Lync Server

Source:        LS AppDomain Host Process

Date:          2/3/2016 7:36:24 PM

Event ID:      50006

Task Category: (1029)

Level:         Error

Keywords:      Classic

User:          N/A

Computer:      SBA.domain.com

Description:

An exception caused the process to stop.

Exception Details. System.ApplicationException: Failed to start Fabric Pool Manager.

   at Microsoft.Rtc.AppDomainHost.Launcher.Initialize(String[] args)

   at Microsoft.Rtc.AppDomainHost.Launcher.Main(String[] args)

Cause: Check the eventlog description.

Resolution:

Examine prior event log entries to find and resolve the problem. If the problem persists contact product support.


to solve the issue, log to SBA in RDP, uninstall windowsfabric using Control Panel, do not reboot and install windowsfabric.msi - take it from Lync 2013 server source DVD.