No internet after update to Sonoma

After reading other posts to turn off network filters I observed that the only two filters were for Kaspersky Internet Security and it would not allow me to disable the filters. I quit the Kaspersky Internet protection app and restarted the Mac. This resolved the problem... I since learned that the macOS now includes antivirus and malware protection XProtect that runs in the background. Also learned that Kaspersky is not compatible with macOS Sonoma, so it looks like I no longer need that software.

Settings>Network>Network Filters

Disabled ‘Little Snitch,’ and all is working.

[Edited by Moderator]

Previously I had Little Snitch installed in my Mac.

Quoted from another answer:

"Settings>Network>Network Filters

Disabled ‘Little Snitch,’ and all is working."

Contacted Apple support. Here is what we did to solve it. seems like my issues were caused by a corrupted time file of some sort.

open terminal

type sudo rm /var/db/timed/com.apple.timed.plist

enter password

restart computer

make sure wifi is connected

settings > time and date > reenable auto date & time

Voila

Time on the MacBook was incorrect and when I set it to the correct date and time in settings all of a sudden the internet started working.

Try going to Settings>Network>Network Filters. Turn them all off and try it.

Could also be a VPN, Antivirus you have installed. Just solved this issue for myself this way.

Same problem, no internet on WiFi or ethernet after Sonoma upgrade.

Disabled AdBlock under Settings>Network>VPN and all now working !

In my case I had a USBC connector going to an old USB hub, which then had an ethernet connector to a hard wired ethernet cable. I eliminated that, and just used a USBC connector going straight to the ethernet cable; that seemed to make all the problems go away. I'd also say in the past I've had success by adding DNS server IP addresses to the DNS entries under Network- click the LAN device you're connecting to, Advanced, DNS and add entries like for google's DNS servers e.g. 8.8.8.8 or 9.9.9.9

In my case it helped to delete the Wifi Network module and reinstall a new one.

System Settings ... > Network > control click onto Wifi -> delete

... button and the bottom > Add Service... -> add a new Wifi module

Problems solved ( at least for me ).

I have a Mac Pro running Sonoma. I tried all the suggestions and nothing worked, still intermittent internet connection issues. I did notice from some log messages this had to do with DNS somehow. My router has OpenDNS IP's hard-coded and none of our other devices (all Apple products, such as iPhones and my wife's Mac Air on Ventura) were having issues at all.

Just on a hunch I logged into my Asus wifi router and set "Connect to DNS Server automatically" to true (eliminating the OpenDNS IP's) and since then I have had no problems. Probably 5 days ago.

Installed Sonoma and internet stopped working. Tried everything. Created new user, it would start back up and stop on both accounts. What finally worked was to remove Thunderbolt Bridge, remove Wifi, and remove all VPN accounts. Restart and add them back one at a time Wifi, Thunderbolt etc... internet issue resolved. I cloud working, Apparently some of the filters, services are not compatible with Sonoma. Will install Antivirus apps and see which push out errors.

For me, in the end, it was the port expander / docking station with hard wired Ethernet. Connected via thunderbolt port. When internet connection drops, I unplug the thunderbolt, wifi kicks in and instantly reconnects. Reconnect thunderbolt and it’s all good. Started happening after Sonoma upgrade.

Do you have other devices that can use the Internet from the same router? If not try rebooting the router.

If other devices can but not macOS with Sonoma, try booting into safemode and then boot back into your regular account normally and test again. Also check System Settings > Wi-Fi and Network to see if they show connectivity.

my issue was fixed turning off "private relay" in icloud settings

Uninstall your VPN app! Then restart the mac. It worked right away. Not enough turning the VPN off, it runs on the background. Thank you Apple Suupprt.

Guess I won’t toss the mac :)