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When adding a computer to a protection group, the Veeam Agent for Microsoft Windows deployment begins and then fails with the following error:
This error occurs because the certificates used to sign the Veeam Agent for Microsoft Windows installer package cannot be validated by the remote machine. This occurs when the Certification Authority (CA) certificate is not installed in the Trusted Root Certification Authority store on the machine where Veeam Agent for Microsoft Windows is being deployed. Such CA certificates are usually located in Trusted Root Certification Authorities of the default Microsoft Windows installation and are updated as a part of the Microsoft Windows update.
The certificates must be checked on the machine where Veeam Agent for Microsoft Windows is failing to deploy. To resolve this issue, review the list of Trusted Certificates and install any missing trusted root or intermediate certificates in the certificate store of the target computer OS.
To verify which CA certificate is needed to validate a signed MSI installer, use the SigCheck utility from SysInternals to retrieve information about the certificate chain the MSI was signed with. For example, to view the certificate chain of the Veeam Agent for Microsoft Windows version installer, run the following command on the Veeam Backup & Replication server:
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