Skype for Business 2015 on Windows 2012 or 2016 raises Error 41026  LS DATA MCU

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Skype for Business 2015 on Windows 2012 or 2016 raises Error 41026  LS DATA MCU

Error 41026

LS Data MCU

Description:

No connectivity with any of Web Conferencing Edge Servers. External Skype for Business clients cannot use Web Conferencing modality.

Cause: Service may be unavailable or Network connectivity may have been compromised.

https://tech24online.com/wp-content/uploads/2017/10/error-1-300x122.png

Resolution:

https://support.microsoft.com/en-us/help/4023993/ls-data-mcu-events-41025-and-41026-are-constantly-generated-after-you

Add a registry entry to exclude the DataMCU process from the new certificate validation process that occurs after you install the .NET Framework update.

Important
Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.

To work around the conferencing modality connection issues in Lync Server 2010, Lync Server 2013, and Skype for Business 2015, you must add an application exception for the Web Conferencing Service (DATAMCUSVC.exe).

To do this, use the following examples to set the exceptions in your environment.

For Skype for Business Server 2015

  1. Determine and record the path of DATAMCUSVC.exe on the server.By default, the installation path is as follows:

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

You can also obtain this information through the Services tool by reviewing the properties of the Skype for Business Server Web Conferencing service. To do this, follow these steps:

  1. Start Registry Editor. To do this, click Start, click Run, type regedit, and then click OK.
  2. Locate the following registry subkey:

HKEY_LOCAL_MACHINE\Software\Microsoft\.NETFramework\v4.0.30319\System.Net.ServicePointManager.RequireCertificateEKUs

Note If you are proactively deploying the update in advance of applying the .NET Framework security update, you must create one or more keys manually because they do not yet exist.

  1. Create the following DWORD name and value:

DWORD Name: Path_obtained_in_Step_1\DATAMCUSVC.exe
DWORD Value: 0

Important Do not include quotation marks in the DWORD name. The new DWORD name and value should resemble the following:

DWORD Name: C:\Program Files\Skype for Business Server 2015\Web Conferencing\DATAMCUSVC.exe
DWORD Value: 0

  1. Restart the Skype for Business Server Web Conferencing service (RTCDATAMCU).

For Lync Server 2013

  1. Determine and record the path of DATAMCUSVC.exe on the server.By default, the installation path is as follows:

C:\Program Files\Microsoft Lync Server 2013\Web Conferencing

You can also obtain this information through the Services tool by reviewing the properties of the Lync Server Web Conferencing service.

  1. Start Registry Editor. To do this, click Start, click Run, type regedit, and then click OK.
  2. Locate the following registry subkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319\System.Net.ServicePointManager.RequireCertificateEKUs

Note If you are proactively deploying the update in advance of applying the .NET Framework security update, you must create one or more keys manually because they do not yet exist.

  1. Create the following DWORD name and value:

DWORD Name: Path_obtained_in_Step_1\DATAMCUSVC.exe DWORD Value: 0

Important Do not include quotation marks in the DWORD name.

The new DWORD name and value should resemble the following:

DWORD Name: C:\Program Files\Microsoft Lync Server 2013\Web Conferencing\DATAMCUSVC.exe
DWORD Value: 0

  1. Restart the Lync Server Web Conferencing Service (RTCDATAMCU).

For Lync Server 2010

  1. Determine and record the path of DATAMCUSVC.exe on the server.Note By default, the installation path is as follows:

C:\Program Files\Microsoft Lync Server 2010\Web Conferencing

You can also obtain this information through the Services tool by reviewing the properties of the Lync Server Web Conferencing Service.

  1. Start Registry Editor. To do this, click Start, click Run, type regedit, and then click Ok.
  2. Locate the following registry subkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v2.0.50727\System.Net.ServicePointManager.RequireCertificateEKUs

Note If you are proactively deploying the update in advance of applying the .NET Framework security update, you must create one or more keys manually because they do not yet exist.

  1. Create the following DWORD names and values:

DWORD Name: Path_obtained_in_Step_1\DATAMCUSVC.exe
DWORD Value: 0

Important Do not include quotation marks in the DWORD name. The w3wp.exe path is case sensitive and should be all in lowercase.

The new DWORD name and value should resemble the following:

DWORD Name: C:\Program Files\Microsoft Lync Server 2010\Web Conferencing\DATAMCUSVC.exe
DWORD Value: 0

  1. Restart the Lync Server Web Conferencing service (RTCDATAMCU).

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