NetVault 11.4 requires DR version 4.0.0.3 latest build released at a minimum.
Here is an extraction from the DR release notes "Addition of data management application version support - This release adds support for Veeam 9.5 and NetVault Backup 11.4."
Please see the DR Release Notes for further reference. https://support.quest.com/dr-series/dr4300/technical-documents
DR management capability: NetVault Backup now supports RDA version 4.0.0532.3 or higher. You can create and manage storage groups, LSUs, and DR users. NetVault Backup 11.4 is supported only with DR Series System version 4.0.0.3 or later
NOTE: Do not upgrade to NetVault Backup version 11.4 if the DR Series System version is lesser than 4.0.0.3. NetVault Backup may not behave correctly if the DR OS version is lesser than 4.0.0.3 due to RDA library compatibility issue. Before upgrade to NetVault Backup version 11.4, it is also recommended to uninstall external RDA library that is lesser than 4.0.0.3
Fix is to upgrade the DR to 4.0.0.3 minimum in which is the current release at the time of the article.
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