Weird Apache web server loggings

Sometimes while handling Apache httpd logs you may have come across such logged lines like:

 

a.b.c.d – – [02/Jun/2017:10:12:06 -0700] “\x16\x03\x01” 500 535 593
a.b.c.d – – [02/Jun/2017:10:12:07 -0700] “\x16\x03\x01” 500 535 484
a.b.c.d – – [02/Jun/2017:10:12:07 -0700] “\x16\x03\x01” 500 535 475
a.b.c.d – – [02/Jun/2017:10:12:07 -0700] “\x16\x03\x01” 500 535 814
a.b.c.d – – [02/Jun/2017:10:12:07 -0700] “\x16\x03\x01” 500 535 515
a.b.c.d – – [02/Jun/2017:10:12:08 -0700] “\x16\x03\x01” 500 535 461

 

What these really are telling you is:

your web server is so configured that it may erroneously trying to speak unencrypted HTTP to a request that came in on port 443 (HTTPS).

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