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BugZero found this defect 1209 days ago.
The installation of the Veeam CDP I/O Filter fails during deployment with the following error:
Veeam Support has determined that this issue is most frequently related to a DNS resolution failure.
All servers involved in the I/O Filter installation, Veeam server, vCenter, and ESXi host(s), must be able to resolve each other via FQDN.
Other requirements can be found here https://helpcenter.veeam.com/docs/backup/vsphere/cdp_requirements.html