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Consider the following scenario:

  • One or more Survivable Branch Appliances or Survivable Branch Servers (SBAs/SBSs) are deployed in a Microsoft Skype for Business 2015 or Lync Server 2013 environment.

  • The servers interact with a trusted application (typically UCMA-based) that queries the presence information for users who are homed on these SBAs/SBSs.

In this situation, when some users' presence information is queried, the Lync Server Front-End service (RtcSrv.exe) of the SBAs or SBSs starts but then crashes within about 20 seconds. Additionally, you receive an event that resembles the following:

Time: Date
ID: 1000
Level: Error
Source: Application Error
Machine: MachineName
Message: Faulting application name: RTCSrv.exe, version: VersionNumber, time stamp: TimeStamp
Faulting module name: wsiphsh.DLL, version: VersionNumber, time stamp: TimeStamp
Exception code: 0xc0000005
Fault offset: 0x0000000000005e2f
Faulting process id: 0x420c
Faulting application start time: Time
Faulting application path: C:\Program Files\Skype for Business Server 2015\Server\Core\RTCSrv.exe
Faulting module path: C:\Program Files\Skype for Business Server 2015\Server\Core\wsiphsh.DLL
Report Id: ReportID
Faulting package full name:
Faulting package-relative application ID:


To fix this issue, please install the following updates:

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