How can I set a certificate's expiration date beyond 2015 using GLP Server 5.6?

There is a known issue with certificates with expiration dates after 2015. In order to apply the correct expiration date to activate these certificates, in the Expiration Year drop-down, select a year between 1995 and 2015. Then select the "Until Certificate Expires" option. This will set the expiration date to the end of the certificate life.