I need help diagnosing and fixing DNS settings:MB Pro won’t connect!

[Christopher11]

My MacBook was froze when I woke up. I force restarted and now I think the DNS settings are messed up. My network is fine but it won’t connect to the internet. In El Capitan on my old MacBook, there was a way in Network Preferences to run diagnostics, but I can’t seem to find that function in this OS.

Thank you sincerely for any help!
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I’m not sure why that diagnostic is no longer available. This happens whenever the cpu freezes up: its like a setting gets corrupted. It was an easy enough fix before.

 

[Erehy Dobon]

You need to post more details before people here can help you.

The best/easiest way would be to post a screenshot or two of the relevant settings

Apple Menu > System Preferences > Network

because a picture is worth a thousand words.

Heck, you don't even mention what type of network connection you are using (Ethernet, wireless, etc.), which specific Mac model and specific version of the operating system.

 

[Christopher11]

It is a 2015 MB Pro running Mojave. I connect via WiFi. With my 2012 MB Pro running El Capitan, there is a button at bottom of Network Preferences, which says Assist Me. When I click that, it gives me the option of Diagnostics. That always fixes this problem. is there a way to get to that function in Mojave? Thank you for any help.

 

[Christopher11]

What I did was, I entered the DNS address from my older MB Pro and that seems to have fixed it. Thank you.

 

[matram]

Good you got it working.

Google has a public DNS at 8.8.8.8 that you can always try in a pinch. The dig command in terminal is also a good diagnostic tool it will show you what name server ”NS” is being queried and what response you are getting back.

 

[Christopher11]

Thank you, that's helpful. I wish Mojave had that same feature Assist Me, which diagnosed and fixed discrepancy in DNS setting.