Are you letting it through?
acl SSL_ports port 443
http_access allow CONNECT SSL_ports
Don't forget to restart squid after making changes or if using webmin, you can quite often just hit Apply Changes.
Also, just as a matter of readability, I get rid of the tons and tons of commented lines in the squid.conf
# Trim down the squid.conf
sed -i.bak '/^$/d; /^#/d' /etc/squid/squid.conf