Alert ID : ALERT920
As announced by the major browser vendors, the untrusting/removal of all 1024-bit roots from their browsers will be initiated in September 2014 into the beginning of 2015.
In this final move to migrate from SSL certificates chained to these roots, we are asking customers to replace any affected SSL certificates before August 31, 2014. RapidSSL offers replacement SSL certificates at no charge.
Impacted certificate can be replaced using the documentation in this link.