To install the AlphaSSL Root Certificates, perform the following steps:
Stronghold needs to have access to the chain of certificates of the CA (certificate authority) that signed the certificate. These certificates are placed by GlobalSignas defualt in the in a file that contains several PEM encoded certificates :
/stronghold/ssl/CA/client-rootcerts.pem
Append the following to the file :
-----BEGIN CERTIFICATE-----
GlobalSign Root CA Certificate
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
AlphaSSL intermediate Certificate
-----END CERTIFICATE----
Save the .pem and restart the server