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Lync or Skype for Business client can't be started to join meeting if default browser is Firefox 52 or a later version

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Symptoms

Assume that the default browser is Firefox and its version is greater than or equal to 52. When you try to click a Skype for Business meeting link to join the meeting that's created at an on-premises server, the Skype for Business web client is opened to join the meeting instead of the Skype for Business desktop client.

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Cause

This issue occurs because the Netscape Plugin Application Programming Interface (NPAPI) plugin is deprecated in Firefox 52 or a later version. NPAPI is currently used as part of the client detection process for the Lync or Skype for Business client when you join a meeting by clicking a link. When NPAPI is disabled, the webpage can’t determine whether you have the client installed.

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Resolution

To fix this issue, install the December 2017 cumulative update 6.0.9319.510 for Skype for Business Server 2015, Web Components Server.

Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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Keywords: kb, kbfix, kbsurveynew, kbexpertiseAdvanced, skype for business can't join meeting

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Article Info
Article ID : 4036619
Revision : 11
Created on : 12/6/2017
Published on : 12/11/2017
Exists online : False
Views : 203