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VeeamCDP I/O filter cannot be installed "Error: the operation is not allowed in the current state"

KB ID: 4168
Product: Veeam Backup & Replication | 11
Published: 2021-05-19
Last Modified: 2021-05-19
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Challenge

The installation of the Veeam CDP I/O Filter fails during deployment with the following error: 
17/02/2021 12:15:55 Error    Installing VeeamCDP components on cluster: <clustername> ... Error: the operation is not allowed in the current state
17/02/2021 12:15:55 Error    Failed to install VeeamCDP I/O filters: Failed to install VeeamCDP I/O filter on cluster: <clustername>

Cause

Veeam Support has determined that this issue is most frequently related to a DNS resolution failure.

Solution

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.

More Information

Other requirements can be found here
https://helpcenter.veeam.com/docs/backup/vsphere/cdp_requirements.html
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