> For the complete documentation index, see [llms.txt](https://docs.parallels.com/landing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.parallels.com/landing/ras-reference-architecture/port-reference-and-ssl-certificates/ssl-certificates/using-enterprise-certificate-authority.md).

# 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.

{% hint style="info" %}
**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.
{% endhint %}


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