Do you know if there are any firewalls/antivirus on your computer or network? We've seen some issues with these devices/software that might be causing the problems.

Can you also attach a net-internals log while experiencing the issue: https://dev.chromium.org/for-testers/providing-network-details

At this point we've turned off the feature for the holidays (it should turn off when you restart Chrome). If you have a chance, information about any firewalls/antivirus that might be affecting the connection would still be useful so we can try to test them/contact them before we re-enable it after the holidays.

You can always force the feature on to test whether it is still causing issues by going to chrome://flags#tls13-variant and setting it to "Enabled (Experiment 2)".

Marking this closed as the current experiment has rolled down, if you have issues again or are able to reproduce the issues by setting chrome://flags#tls13-variant to "Enabled (Experiment 2)", please reopen an issue with details about your firewalls/antivirus that may be causing issues, along with a net-internals log (https://dev.chromium.org/for-testers/providing-network-details).

My computer runs Avast antivirus. I can't think of anything else. I have
attached my net internals log. Thank you.

Best,
~Stephen~

We've heard a number of bugs regarding Avast AV. Do you know what version of Avast you are running?

(Also, it looks like your net internals log didn't attach.)