Comment 50 for bug 1169505

fwiw, I had this issue with upgrading from 5.5.29 to 5.5.33 in Percona-server. I was using certs that I found from 2010. I regenerated the certificates using

openssl req -x509 -days 365 -newkey rsa:2048 -keyout server-key-enc.pem -out server-cert.pem -passout pass:qwerty
openssl rsa -in server-key-enc.pem -out server-key.pem -passin pass:qwerty -passout pass:

These keys made it work. I chalk it up to these being made 3 years ago (still set to expire many years from now) from some old version of openssl.