For NDC Host's RapidSSL certificates in newer browsers (such as Chrome, IE9, etc.) an intermediate CA bundle is needed as these browsers no longer provide the CA for RapidSSL. You will see an error like the one below from Google Chrome if the CA bundle is not installed with your certificate.

To rectify this, reinstall the certificate using the following CA bundle:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIDfTCCAuagAwIBAgIDErvmMA0GCSqGSIb3DQEBBQUAME4xCzAJBgNVBAYTAlVT
MRAwDgYDVQQKEwdFcXVpZmF4MS0wKwYDVQQLEyRFcXVpZmF4IFNlY3VyZSBDZXJ0
aWZpY2F0ZSBBdXRob3JpdHkwHhcNMDIwNTIxMDQwMDAwWhcNMTgwODIxMDQwMDAw
WjBCMQswCQYDVQQGEwJVUzEWMBQGA1UEChMNR2VvVHJ1c3QgSW5jLjEbMBkGA1UE
AxMSR2VvVHJ1c3QgR2xvYmFsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB
CgKCAQEA2swYYzD99BcjGlZ+W988bDjkcbd4kdS8odhM+KhDtgPpTSEHCIjaWC9m
OSm9BXiLnTjoBbdqfnGk5sRgprDvgOSJKA+eJdbtg/OtppHHmMlCGDUUna2YRpIu
T8rxh0PBFpVXLVDviS2Aelet8u5fa9IAjbkU+BQVNdnARqN7csiRv8lVK83Qlz6c
JmTM386DGXHKTubU1XupGc1V3sjs0l44U+VcT4wt/lAjNvxm5suOpDkZALeVAjmR
Cw7+OC7RHQWa9k0+bw8HHa8sHo9gOeL6NlMTOdReJivbPagUvTLrGAMoUgRx5asz
PeE4uwc2hGKceeoWMPRfwCvocWvk+QIDAQABo4HwMIHtMB8GA1UdIwQYMBaAFEjm
aPkr0rKV10fYIyAQTzOYkJ/UMB0GA1UdDgQWBBTAephojYn7qwVkDBF9qn1luMrM
TjAPBgNVHRMBAf8EBTADAQH/MA4GA1UdDwEB/wQEAwIBBjA6BgNVHR8EMzAxMC+g
LaArhilodHRwOi8vY3JsLmdlb3RydXN0LmNvbS9jcmxzL3NlY3VyZWNhLmNybDBO
BgNVHSAERzBFMEMGBFUdIAAwOzA5BggrBgEFBQcCARYtaHR0cHM6Ly93d3cuZ2Vv
dHJ1c3QuY29tL3Jlc291cmNlcy9yZXBvc2l0b3J5MA0GCSqGSIb3DQEBBQUAA4GB
AHbhEm5OSxYShjAGsoEIz/AIx8dxfmbuwu3UOx//8PDITtZDOLC5MH0Y0FWDomrL
NhGc6Ehmo21/uBPUR/6LWlxz/K7ZGzIZOKuXNBSqltLroxwUCEm2u+WR74M26x1W
b8ravHNjkOR/ez4iyz0H7V84dJzjA1BOoa+Y7mHyhD8S
-----END CERTIFICATE-----