TIP 1519: Skype for Business 2015 Debugging Tools and VC++ 2013 Runtime

Attempts to install Skype for Business 2015 Debugging Tools* on an administrative workstation or server running a supported Windows OS may fail with the error:

Skype for Business 2015, Debugging Tools installation or uninstallation requires that Microsoft Visual C++ 2013 x64 Minimum Runtime – 12.0.21005 Package is already installed. Either use Setup.exe for installation or run vcredist_x64.exe included with the product to install the redistributable.
[ OK ]

You can either ensure that …

… the target machine has completed running setup.exe from the Skype for Business Server 2015 media, which includes the prerequisite VC++ 2013 runtime that you must install anyway, or install from a downloadable copy of the Visual C++ Redistributable Packages for Visual Studio 2013#.

Note that unlike in Lync Server 2013, a “Lync-specific” version of the latter does not appear to be a requirement.

* SkypeForBusinessDebugTools.msi
v9319.73 released 29 July 2015 – includes Snooper, CLSLogger, CLSScenarioEdit.psm1

# KB2883200 is needed for Windows Server 2012 R2 and Windows 8.1

TIP 1517: Skype Business Edge – Schannel EventID 36888

Found an interesting article giving a nice look into why the error “Schannel EventID 36888” consistently appears in the Windows SYSTEM log:

A fatal error was generated and sent to the remote endpoint. This may result in termination of the connection. The TLS protocol defined fatal error code is 10. The Windows Schannel error state is 1203.

This is found to affect Skype for business / Lync Server holding Edge server roles and can impact other Windows Server with detailed SChannel logging enabled.

How to enable Schannel event logging in IIS (link)

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