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Himanshu Singh's avatar
Himanshu Singh
Iron Contributor
Mar 18, 2022

Excessive too frequent Proxy PAC File download ?

What is WinInet ?

What is WinHttp ?

Where does system proxy Netsh falls out of the two above

Where does the usual internet option -> connections -> lan settings falls under which one

 

We use cloud based proxy server which also install a client/agent on the windows client

What we have recently noticed is the download of Proxy PAC File is too many times from windows

may be 10 times in a minute

 

What is the standard duration/frequency for download Proxy PAC File on a windows client

what is and how is this service WinHttpautoproxysvc related here as what we notice using network tracers user agent showing which is making request for PAC file is either this server or browser

 

How to detect what is causing this or is this a standard behavior 10 times PAC file download per minute ?

 

BR,
/HS

 

 

 

2 Replies

  • dsuski's avatar
    dsuski
    Copper Contributor
    seeing the same thing. seems to have started recently, we had enabled the "disable caching" of proxy in gpo, just disabled it, waiting to see if it helps. Not sure if an update or patch changed anything
    • Himanshu Singh's avatar
      Himanshu Singh
      Iron Contributor
      Hello,

      right it could be same or similar thing in my environment where network team might have changed similar settings, just to share more here i my case we have end user desktop client also installed on each company computer which has this proxy client controlling entire http traffic which was recently upgraded so my doubt is combination of client version and some setting due to some behavior in the new client version

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