Weird kex_exchange_identification log messages [SOLVED]

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I keep getting these errors showing up in the log from sshd:

error: kex_exchange_identification: banner line contains invalid characters

I finally tracked them down and understand the nonsense that
is happening:

For historical reasons (having to do with butthead IT people
at work deciding outgoing sshd should be blocked by firewall),
I listen on the https port (443) as well as the normal 22 on my
sshd at home.

Apparently "helpful" web browsers on my android devices and
wot-not decide they ought to probe connections to see if https
is possible before falling back to http, so they all probe
my ssh daemon :-).

The error has been happening forever, but the latest sshd
now logs it (it previously just ignored it).
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