Error: Installed Certificates for the domain(s): Unable to determine host for certificate! Unknown Error
This error will occur if a PKCS #7 certificate file format is uploaded on cPanel 11 server during SSL certificate installation. The correct certificate file format to install on cPanel 11 is X.509 base-64 encoded file.
To resolve this issue on cPanel 11, perform the following steps.
Step 1: Download the X.509 certificate from Symantec
How to download issued SSL certificate in the Managed PKI Control Center
Step 2: Install SSL and Intermediate CA on cPanel 11
Click here for steps to install the Intermediate CA & SSL certificate on cPanel 11.