[users@httpd] Apache responding with wrong protocol

[Felix Kloft <fe...@gmail.com>]

I'm trying to set up Apache 2.4.25 with a Let's Encrypt certificate on
Raspian Stretch. However, I can't get SSL working. Apache keeps
responding with a 400 using HTTP instead of doing the SSL handshake.
What's most confusing is that the log produces lines like:

hostname:80 148.72.168.62 - - [31/Jan/2018:18:23:13 +0100]
"\x16\x03\x01" 400 0 "-" "-"

i.e. it says the request was coming in through port 80, even though it
didn't. I changed my configuration to include 'Listen 443 https' and
disabled the default listener on port 80. I made sure no process is
listening on 80 and Apache is indeed bound to 443, but it still logs
port 80 and responds with 400. I tried other ports as well. I verified
the requests were coming in through the right port using "sudo nc -l
<port>" while Apache was stopped.

SSLEngine is on, mod_ssl is enabled, and the paths for the certificate
have been set up by certbot.

Any help would be appreciated.

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