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Event 1000 occurs and the Rtcsrv.exe process crashes on a Skype for Business Server 2015 Front End server

When the Microsoft Skype for Business Server 2015 Front End (FE) server communicates together with a peer server through the Transmission Control Protocol (TCP) protocol, the FE service (Rtcsrv.exe) crashes. Additionally, the following event is logged in Application log:

Log Name: Application
Source: Application Error
Date: Date/Time
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: ServerName
Faulting application name: RTCSrv.exe, version: XXXX, time stamp: XXXX
Faulting module name: SIPStack.dll, version: XXXX, time stamp: XXXX
Exception code: 0xc0000005
Fault offset: 0x0000000000442aa1
Faulting process id: 0x1ab4
Faulting application start time: XXXXXXXXXXXXXXXXXX
Faulting application path: C:\Program Files\Skype for Business Server 2015\Server\Core\RTCSrv.exe
Faulting module path: C:\PROGRA~1\SKYPEF~1\Server\Core\SIPStack.dll

The crash typically occurs every 24 hours after the FE server restarts.
This issue occurs because the server applies incorrect logic to validate the address of the trusted TCP server.
To fix this issue, install the March 2016 cumulative update 6.0.9319.235 for Skype for Business Server 2015 Front End server and Edge server.
More information
Microsoft strongly recommends that you use Transport Layer Security (TLS) to help provide superior security through encryption and peer server authentication. Support for TCP connections to trusted applications is currently limited (for example, there is no support for IPv6), and the support may be deprecated in future releases of the product.

This issue can occur if the EnableTCP parameter is used together with the New-CsTrustedApplication cmdlet. This parameter tells Lync that the trusted application will use TCP. Use this parameter only if the trusted application is not a Microsoft Unified Communications Managed API (UCMA) application. This is because UCMA applications support only the mutual Transport Layer Security (MTLS) protocol. If you don't specify the Force parameter together with the EnableTCP parameter, you receive a confirmation prompt before the new trusted application is created.

Article ID: 3141114 - Last Review: 03/18/2016 23:28:00 - Revision: 1.0

Skype for Business Server 2015

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