After updating to macOS Sonoma last night, I found myself unable to get online this morning. It took me a while to figure out, but the problem ended up being Little Snitch, a reverse firewall. I was running a version that wouldn’t run correctly on Sonoma, but since it was blocking access to the internet for everything I couldn’t update it. I had to go to System Settings > Network > Filters and turn off Little Snitch to stop filtering my internet connection through it, then I was able to get online and run the update.
Microblog post
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