Use IIS to receive a certificate from the Enterprise CA and export the certificate in the PFX format. To install the PFX certificate in Parallels RAS, import it as described in the Import the certificate subsection above.
Note: The trusted.pem file on the Parallels Client side must include the intermediate certificate to be able to verify the cert from the third-party vendor. If the intermediate certificate for the vendor is not in the trusted.pem file, you will have to paste it in manually or create a trusted.pem template file with the proper Intermediate Certificates and then replace the old trusted.pem file with the newly updated one. This file resides in the Program Files\Parallels or Program Files(x86)\ Parallels on the client side.