Using a Certificate Signed by Internal or Public CA

If you want to use a certificate signed by a public or internal Certification Authority (CA), consider the following:

• Make sure that Veeam Backup & Replication server and Veeam Agents trust the CA. That means that the Certification Authority certificate must be added to the Trusted Root Certification Authority store on the Veeam Backup & Replication server. Also, Certificate Revocation List (CRL) must be accessible from the Veeam Backup & Replication server.
• If you use Windows Server Certification Authority, issue a Veeam Backup & Replication certificate based on the built-in Subordinate Certification Authority template or templates similar to it. You can manage templates with the Certificate Templates MMC snap-in.

• [For Linux-based Veeam Agent computers] OpenSSL version 1.0 or later must be installed on the Veeam Agent computer.

A certificate signed by a CA must meet the following requirements:

• The certificate subject is equal to the fully qualified domain name of the Veeam Backup & Replication server. For example: vbrserver.domain.local.

• The Subject Alternative Name field contains both the FQDN and the NetBIOS name. You can add multiple DNS entries in the following format: DNS:vbrserver.domain.local,DNS:vbrserver.

• The minimum key size is 2048 bits.
• The following key usage extensions are enabled in the certificate:
• Digital Signature
• Certificate Signing
• Off-line CRL Signing
• CRL Signing (86)

• The Path Length Constraint parameter in the Basic Constraints extension is set to 0.

If you use Windows Server Certification Authority, open the Certificate Templates MMC snap-in and select the certificate template based on the built-in Subordinate Certification Authority template or templates similar to it. On the Extensions tab, enable the Do not allow subject to issue certificates to other CAs option.

• The key type in the certificate is set to Exchange.

To start using the signed certificate, you must select it from the certificates store on the Veeam Backup & Replication server. To learn more, see Importing Certificates from Certificate Store.