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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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