BackupExec 2015 and DAG backup


I am evaluating backupexec 2015 to backup exchange (passive DB server).  I installed the agent on all DB servers.

On the Symantec server I test connection to the DAG either with administrator or system account I receive and Credential Status error that says "Server is not trusted" and "test failed".   If I try to test again I receive a Browse failure error.  I was reading somewhere that I need to install the agents not only DB servers but also the CAS servers, is this true?  Any help is appreciated.

FYI - I test passes to all DB servers.

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I don't think we need to install agent on the CAS Servers.
"Server is not trusted" is a different error message.

See if the below article will help to resolve the trust error messges

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