In Microsoft Skype for Business Server 2015, the Application Sharing Multipoint Control Unit (ASMCU) service of Front End Server may crash intermittently. Users cannot create screen sharing sessions and all connected users lose their app sharing sessions. To restore the service, the ASMCU service needs to be restarted.
In addition, the following events could be logged:
Log Name: Lync ServerSource: LS ApplicationSharing Conferencing ServerDate: DateEvent ID: 32011Task Category: (1304)Level: ErrorKeywords: ClassicUser: N/AComputer: frontend.contoso.comDescription:The Application Sharing Server has failed to create a conference because of an internal failure.Log Name: ApplicationSource: Application ErrorDate: DateEvent ID: 1000Task Category: (100)Level: ErrorKeywords: ClassicUser: N/AComputer: frontend.contoso.comDescription:Faulting application name: ASMCUSvc.exe, version: 6.0.9319.281, time stamp: 0x58df5d92Faulting module name: APPSHAPI.dll, version: 6.0.8886.22, time stamp: 0x5550f0b0Exception code: 0xc0000005