I have exchange 2010 Dag consisting of 2 nodes and 2 nodes for the CAS and Hub Trnasport roles. I have been using BE2012 to back up the DAG for months now with no issues all the sudden the credentials are failing nothing has changed password wise. Under the credential tests for the BE job it lists EX00 as the target the default user is the system logon account which passes the test but the information store, mailbox database, and public folder database all fail. If I try to reinstall the agent, I get error connecting to remote computer. Any suggestions?