https://bz.apache.org/bugzilla/show_bug.cgi?id=69743

--- Comment #12 from Nick Bedford <webmas...@healthia.com.au> ---
We also have the same AWS ALB -> EC2 Let's Encrypt setup and we have just
started receiving 421 Misdirected Request responses despite our Apache2 being
version 2.4.52 on the server. Nothing on our end has changed despite the server
name indication working for the last six years.

The only thing out of our control is the Application Load Balancer itself. If
it never sent the SNI or was able to do server name determination at the
Apache2 server in the first place, we would have had this issue for six years,
but only since yesterday has it now surfaced.

My only guess right now given that our EC2 is running Apache 2.4.52 is that the
Load Balancer has changed and is now dropping SNI.

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