Bay Area AT&T Fiber Customers suffering bit flipping for two weeks (twitter.com)

For those wondering how bad the issue is, check out this[1] screenshot of a diff between the TLS/non-TLS html from www.example.com.

Here's "corrupted" UTF-8 characters expressed as bits. In this example you can see clearly what's happening. The top byte is correct and the second one is corrupted.

    01100111 # g
    01101111 # o

    01110000 # p
    01111000 # x

    01101100 # l
    01100100 # d

    01100101 # e
    01101101 # m

1. https://i.imgur.com/qIMnTTe.png

Awesome diagnosis against a hostile black box. Well done!

This is probably a better thread: https://twitter.com/bmastenbrook/status/1335322652462829568

Jesus this explains so many intermittent issues I've been having over the last week.

I'm on Fiber from Sonic and last week I was experiencing issues with connections randomly being dropped and being extremely slow to load. Sonic tech came out and said that the uplink was good and that it might be a problem with my UniFi system, but I don't have any issues with my LAN services.

It's great that the community was able to diagnose this, but a shame that AT&T didn't pick it up first and isn't acknowledging an issue on their network.

Hmmmmm... this explains so much :-(