We use StartCom as our Certificate Authority to secure all of our Web Sites.
Almost all browsers support StartCom Certificates ( probably 99.9% ) but in case you are using some off browser or operating system that does not include their CA Certificates we have attached them below.
You will need to click on the Certificate and select install when prompted, click on each file, ca-bundle, sub.class1, and sub.class2.
Class 1 Server Certificate
Class 2 Server Certificate
SHP IT/IS Department