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DNS keeps resetting - MacOS

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#1 daemelve


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Posted 07 March 2017 - 08:35 AM



I have been having intermittent problems connecting to the internet. When I find what I think is a resolution it works OK for a bit and then I lose connectivity again. The next "fix" seems to work and then off we go again. (I have detailed below the various things I have tried).


I am using an iMac with Sierra. The DNS setting is  I have tried updating to something more stable (eg. and but it reverts to - sometimes as I am updating the setting, always within a minute or two.  I have several other internet connected devices that do not have this problem so I am confident the problems lies with this computer. They were all using the same flakey DNS but have allowed me to update them to the google ones.


I have run malwarebytes, but that hasn't detected anything.


To begin with all I had to do was switch wifi off and on again and it would be ok, Once that stopped resolving the issue I needed to shut down the mac. Next I ran 

sudo dscacheutil -flushcache;sudo killall -HUP mDNSResponder.

Starting in safe mode worked a few times.

Then a PRAM reset worked for a couple of times.

Then unloading and reloading mDNSResponder.plist worked a couple of days ago.

Now I try all and any combination of the above (plus swearing at it a lot), sometimes it connects other times it doesnt so I just give up!


Please help, let me know if you need anything else or if I should be posting this elsewhere

Many thanks



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#2 boopme


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Posted 29 March 2017 - 02:09 PM

Hi sorry for the delay, please post in the MAC forum.
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