Unable to use pass phrase protected key with https_port option in squid.conf.

Issue

• Squid prints following error in /var/log/squid/cache.log at start up when a certificate and pass phrase protected key is used with "https_port" parameter:

2012/09/18 09:54:51| Ignoring https_port [::]:443 due to SSL initialization failure.

• Following configuration is used in /etc/squid/squid.conf where /etc/squid/certs/key.pem is pass phrase protected:

 https_port 443 accel cert=/etc/squid/certs/cert.pem key=/etc/squid/certs/key.pem defaultsite=example.com protocol=http