What is the mDNS firewall entry in Windows 10?

Discussion in 'Windows 10' started by Phoenix, Dec 9, 2016.

  1. Phoenix

    Phoenix MDL Expert

    May 30, 2014
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    I noticed that in the Firewall rules there is something called mDNS so I unchecked it from having internet access. Reminds me of the mDNSResponder.exe that came bundled with the Bonjour service when you install iTunes that is used to send Apple info about how you use your PC

    Is this something critical for the OS or is it used for telemetry purposes to send info to Microsoft?
     
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  2. Hadron-Curious

    Hadron-Curious MDL Guru

    Jul 4, 2014
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    I don't think it is about telemetry. The reason you have it in your Firewall is becaue you either install iTunes in the past which included Bonjour or you have Ubuntu bash on your Windows 10 enabled.
     
  3. Phoenix

    Phoenix MDL Expert

    May 30, 2014
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    no man that entry is there on a fresh install with 0 software installed so I wanted to know what it does or am I wrong in disabling it?
     
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  4. Enthousiast

    Enthousiast MDL Tester

    Oct 30, 2009
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    It's not in 8.1, i think it's from the linux part of windows 10.
     
  5. SpeedDream

    SpeedDream MDL Addicted

    Feb 20, 2012
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  6. LatinMcG

    LatinMcG Bios Borker

    Feb 27, 2011
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    Apple Bonjour
     
  7. Hadron-Curious

    Hadron-Curious MDL Guru

    Jul 4, 2014
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    You can check the ISO you use to do the clean install perhaps it has Windows sub-system for Linux file in it. Either way I still don't think it's about telemetry. If you are not comfortable with the protocol all rather feature it is good you block it.
     
  8. dmex

    dmex MDL Junior Member

    Apr 20, 2011
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    Linux processes do not have firewall entries since you can't block or allow them using the Firewall (yet).

    The rule properties show the dnscache (C:\WINDOWS\System32\dnsrslvr.dll) as the "mdns" firewall rule... btw, blocking DNS is probably a bad idea.