Symptoms
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 Server
Source: LS ApplicationSharing Conferencing Server
Date: Date
Event ID: 32011
Task Category: (1304)
Level: Error
Keywords: Classic
User: N/A
Computer: frontend.contoso.com
Description:
The Application Sharing Server has failed to create a conference because of an internal failure.
Log Name: Application
Source: Application Error
Date: Date
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: frontend.contoso.com
Description:
Faulting application name: ASMCUSvc.exe, version: 6.0.9319.281, time stamp: 0x58df5d92
Faulting module name: APPSHAPI.dll, version: 6.0.8886.22, time stamp: 0x5550f0b0
Exception code: 0xc0000005
Resolution
To fix this issue, install the following updates:
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The May 2019 cumulative update 6.0.9319.548 for Skype for Business Server 2015, Front End Server and Edge Server.
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The May 2019 cumulative update 6.0.9319.548 for Skype for Business Server 2015 and Unified Communications Managed API 5.0 Runtime.
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The May 2019 cumulative update 6.0.9319.548 for Skype for Business Server 2015, Web Components Server.
