# Using Enterprise Certificate Authority

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.

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**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.
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