If you worried much about expiration of your free SSL certificate, I advise you to invest some $ on domain validated SSL certificate.

Advantages 1. No Expiration for 3 Years 2. 256-bit strong encryption with 2048-bit SSL certificate 3. Domain validation by trusted Root certificate authority. 4. Lowest price SSL

Get Comodo PositiveSSL Certificate at only $4.99/year from CheapSSLSecurity and make your self free from SSL Expiration.

Visit here for mode details - https://cheapsslsecurity.com/comodo/positivessl.html.