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The download for PAC file is frequently requested from the Skype for Business or Lync 2013 client

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Assume that a URL of a Proxy Automatic Configuration (PAC) file is used in Internet Explorer proxy settings. When Microsoft Lync 2013 (Microsoft Skype for Business) uses the PAC file to connect to a suitable proxy server, the PAC file is downloaded on every HTTP-based proxy request. It causes heavy network and server loads.

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Cause

This issue occurs because the PAC file for HTTP-based proxy resolution isn't cached by WinHTTP when the URL of the PAC file is explicitly specified in Internet Explorer settings. It causes the PAC file to be downloaded for each HTTP request by Lync 2013 (Skype for Business).

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Resolution

To fix this issue, install the October 13, 2015 update (KB3085581) for Lync 2013 (Skype for Business).

Note Lync 2013 was upgraded to Skype for Business in April 2015.

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Keywords: kb, kbfix, kbqfe, kbsurveynew, kbexpertiseinter

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Article Info
Article ID : 3096508
Revision : 1
Created on : 1/7/2017
Published on : 10/13/2015
Exists online : False
Views : 166