Internet issues on Monterey

You're right. That was a typo. I meant to enter 12.1. I saw 12.0 in your first post and didn't realize you have updated from it to 12.1.

You might try the OpenDNS servers:

Also boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

The problem occurred again, despite of my previous answer. And I 'solved' it again... This time what worked for me:

The were two routers set as router in my household: the modem from my ISP is from ZTE, model H369A, and TP-Link Archer AX10.

Ok, now I've set the TP-link from Operation Mode to Access Point Mode.

Hope this helps!

I have this issue too with latest Monterey 12.2.1, the behavior is:

once in a few days, my Mac does not resolve DNS...

ping IP works, ping domain name does not resolve; (but "host domain" does return result, is that strange?)

Safari / Firefox do not work to browse internet, but Chrome works (maybe it has its own way to resolve DNS or have a local dns cache?)!

No firewall in place - so definitely not a firewall issue

Reset wifi profile (remove and add back or removing plist files etc.) do not help...

when issue happens, wifi and wired connections both have this issue...

changing dns server to local ISP's, google's public DNS or whatever - does not help...

no other way to fix, but a complete reboot of my Mac and everything goes back to normal...

that is a big pain..I am almost about to return my new Mac if I did not see this discussion thread and knew that it is probably a OS issue rather than a hardware issue...

There may be multiple paths to the issue. I do not run CISCO software, but I still get corrupt DNS Cache structures multiple times an hour. I'm running a cron job that flushes the cache every 30 seconds, essentially disabling the local cache, in order to keep my access working.

sudo killall -HUP mDNSResponder

sudo killall mDNSResponderHelper

sudo dnscacheutil -flushcache

macOS 12.2.1. I have not pushed 12.3 to my hosts yet. Happens with multiple ISP's in multiple locations. My High Sierra 32-bit dev box has no issues...

Just got a new M1Max MBP running 12.3.1 and this is still an issue. I need to toggle the WiFi off and on to clear the issue - sometimes as often as every few minutes.

My first new Mac in 11 years (I run an early 2011 MBP with no issues) and I'm close to returning it. :(

macOS 12.1 is out now, you may try to upgrade. Release note does not indicate a bug fix related to this issue, but you never know. It does still make sense to upgrade if you are running 12.0.1.

I reset my NVRAM and that fixed it issue. its been weeks and I had no network disconnects on my macbooks.

Did you try rebooting the modem? See my "solution" one post above yours.

I have also seen this issue. I have a little more info. So initially it looks like a DNS issue, I was seeing DNS lookups fail on WiFi for a few of upgraded users (3 out of 20). I managed to get hold of one of the Macs today and sure enough after a few minutes of use (different network, different building, other Macs working ok) DNS seems to fail for WiFi. So via a Dock I plugged it into the network and it worked. Go back to the WiFi even after switching WiFi off and on, still didn't work. So rebooted the Mac and tried it just on LAN. It had the same problem after a few minutes, switched it over to WiFi and it worked again. So it seems to be per interface rather than the whole I.P. network setup. The only common factor was all the Macs updated to Monterey, not a fresh install. I tried flushing DNS while it had the problem with "sudo killall -HUP mDNSResponder" but this made no difference. I am really hoping that when 12.1 releases it will fix this issue. The only other thing I am going to try is a bare metal re-install of Monterey on one of the machines that has a problem to see if the problem still happens. The 3 Macs I have seen the issue on are (13" Macbook Pro Intel, 16" Macbook Pro Intel and a 13" Macbook Pro M1)

Thanks! This is a great answer. I also have AnyConnect and have been losing my internet connection about once per day since the Monterey upgrade.

Two things about Apple:

(1) I called Apple Support they told me to uninstall AnyConnect because "Monetery doesn't like VPN". Obviously this is not possible for me because I need to WFH, but the support person sounded too bored to care.

(2) In this thread the "Apple recommended" answer is completely irrelevant.

It's crazy that we are stuck between Apple and Cisco :-(

I’m new here so apologies for any errors!!

I started getting problems with Monterey 12.2.1 2 weeks ago. Webpage loading would hang or halt, eventually showing a message saying I wasn’t connected to the internet. I restarted the router and Mac with no change. The vendor suggested I shouldn’t have upgraded from Big Sur; he may have a point. He also suggested I try hardware reset (unplugging the power cord for 30mins) and an NVRAM reset. Not sure which worked but connectivity is now OK but it’s only a few hours since resets.

What causes these issues?

Highly recommend you contact AppleCare and open a case with engineering and provide all of the data and issues. A case number will be assigned and Apple engineers are assigned to review and look at the situation. This is the best way to get the issue queued for review or repair I have found to date

Rest NVRAM after the upgrade. This will resolve the issue.

I got so sick of it, I went back to Big Sur two weeks ago. No more problems.