Shulou(Shulou.com)06/02 Report--

As I have encountered this problem with many customers, I share it so that you can have some help when you encounter similar problems.

Below, I would like to share the process of handling this problem as follows:

Problem description:

I have encountered this problem in two projects, one is a new deployment of Skype for business server 2015, and the other is an upgrade from lync server 2010 to lync server 2013.

The problem encountered is that an error was reported when performing PPT sharing, whiteboard and voting. The error is as follows:

In the event Viewer, there are the following events:

Event ID:41025\ 41026

Solution:

This problem occurs because Microsoft .NET Framework 4.5.2 or a later version is installed and MS16-065 installation update is installed.

We have the following quick solutions to this problem:

1. Update the lync client patch. The patch version requires the following:

1) Deferred Channel (DC): Office version 16.0.6741.2048 and later versions

2) All other channels: Office version 16.0.6965.2058 and later versions

3) Lync 2013 (Skype for Business): Builds 15.0.4833.1001 and later versions

2. Since this problem occurs on both lync server 2010 and 2013&skype for business server 2015, you need to add relevant registry keys on these servers to skip EKU checking:

In the following registry location: HKEY_LOCAL_MACHINE\ Software\ Microsoft.NETFramework\ v4.0.30319\ System.Net.ServicePointManager.RequireCertificateEKUs

Add the DWORD key value:

DWORD Name: path_install\ DATAMCUSVC.exe

DWORD Value: 0

The value of path_install is the installation path of lync server or skype for business server. Refer to the following:

Skype for business server 2015:

C:\ Program Files\ Skype for Business Server 2015\ Web Conferencing

Lync server 2013:

C:\ Program Files\ microsoft lync server 2013\ web conferencing

Lync server 2010:

C:\ Program Files\ Microsoft lync server 2010\ web conferencing

You can also save the following values as a REG file and double-click on the server to execute: Lync Server 2010:

Reg add HKLM\ SOFTWARE\ Microsoft.NETFramework\ v2.0.50727\ System.Net.ServicePointManager.RequireCertificateEKUs / v "C:\ Program Files\ Microsoft Lync Server 2010\ Web Conferencing\ DataMCUSvc.exe" / t REG_DWORD / d 0 / f

Note: Lync Server 2010 still uses the .NET 3.5 this is why we use v2.0.50727.

Lync Server 2013:

Reg add HKLM\ SOFTWARE\ Microsoft.NETFramework\ v4.0.30319\ System.Net.ServicePointManager.RequireCertificateEKUs / v "C:\ Program Files\ Microsoft Lync Server 2013\ Web Conferencing\ DataMCUSvc.exe" / t REG_DWORD / d 0 / f

Skype for Business Server 2015:

Reg add HKLM\ SOFTWARE\ Microsoft.NETFramework\ v4.0.30319\ System.Net.ServicePointManager.RequireCertificateEKUs / v "C:\ Program Files\ Skype for Business Server 2015\ Web Conferencing\ DataMCUSvc.exe" / t REG_DWORD / d 0 / f

After the above registry keys are added, we need to restart the Web Conferencing service with the following command:

Stop-CsWindowsService-InputObject RTCDATAMCU

Start-CsWindowsService-InputObject RTCDATAMCU

3. If we are deploying skype for business server 2015, Microsoft released a fix for this problem in December 2017, which can be downloaded from the following link:

Https://www.microsoft.com/en-us/download/details.aspx?id=47690

The above three methods can solve this problem quickly. I hope it will be helpful to you.

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