Enterprise Certificates And Format

[IESSysAdmin]

I am trying to create a valid certificate for my NMC3 (AP9641). Using the Configuration > Security > SSL Certificates page, I updated my CA certificate as a .cer. The site says it is a valid certificate. I made a web certificate with the HOSTNAME as the CN and the FQDN name for the CN. I updated it to the NMC and it says the certificate is invalid. I removed the Self Signed Certificate for APC and reloaded so it used the issued Web Certificate from the CA. I have the CA installed on my machine. When I go to access the NMC it gives me one of 2 errors. ERR:COMMON_NAME_INVALID or ERR:CA_AUTHORITY_INVALID. The certificate that I can see from the NMC shows the cert from the CA but does not show the CA in the Hierarchy. 

Am I missing something when creating the certificate and issuing it or accessing it? I am trying to make it a trusted certificate when accessing the NMC.