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What is mDNSResponder - and why is it running on my Mac?

I found this running this morning.

iMac with Retina 5K display, macOS High Sierra (10.13.3), 27 inch - Purchased January 2018

Posted on Mar 10, 2018 3:59 AM

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Posted on Mar 10, 2018 9:20 AM

mDNSresponder is a process required for discovering Macs used for Back to My Mac as well as related Bonjour device discovery features. It was briefly superseded by the ill-fated discoveryD which never worked right.


Like many other macOS components it’s required for proper operation, so make no attempt to delete it or prevent it from working.

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Mar 10, 2018 9:20 AM in response to HunterBD

mDNSresponder is a process required for discovering Macs used for Back to My Mac as well as related Bonjour device discovery features. It was briefly superseded by the ill-fated discoveryD which never worked right.


Like many other macOS components it’s required for proper operation, so make no attempt to delete it or prevent it from working.

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Mar 10, 2018 5:31 AM in response to HunterBD

It is an essential piece of system software. There is nothing wrong. If you start looking for things you are going to find a lot that you don’t know, and don’t need to know. Just enjoy your mac. Or if you are having a problem describe it clearly so you can get adequate help.

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What is mDNSResponder - and why is it running on my Mac?

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