Microsoft KB Archive Search

Notice: This website is an unofficial Microsoft Knowledge Base (hereinafter KB) archive and is intended to provide a reliable access to deleted content from Microsoft KB. All KB articles are owned by Microsoft Corporation. Read full disclaimer for more details.

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

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

View products that this article applies to.

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.

↑ Back to the top

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).

↑ Back to the top

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.

↑ Back to the top

Keywords: kb, kbfix, kbqfe, kbsurveynew, kbexpertiseinter

↑ Back to the top

Article Info
Article ID : 3096508
Revision : 1
Created on : 1/7/2017
Published on : 10/13/2015
Exists online : False
Views : 295