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1) Add Lotus Domino server under USER DEFINED SELECTION with IP address.
How to create a user-defined selection in Backup Exec for Windows Servers
2) Make sure the Remote Agent is trusted by BE Media server.
About establishing a trust relationship between the media server and a remote computer
3) Make sure the Remote Agent publishing is enabled.
How to enable/disable advertising (publishing) on Remote Agent for Windows Servers in Backup Exec for Windows Servers