The Avamar agent service (avagent) is responsible for all communication between the Avamar client and the Avamar server's utility node. It handles registration, workorder requests, and status updates. The avagent.log file, located in the client's avs/var directory, is the primary source for troubleshooting initial connection problems, authentication failures, or any general communication errors between the client and the server before a specific backup or restore job begins.

B. COD-workorder-Windows.log is a client-on-demand workorder log, detailing the specifics of a user-initiated backup job, not general agent-to-server communication.

C. MOD-workorder-Windows.log is a management-on-demand workorder log for scheduled backups initiated by the server, not for general communication issues.

D. err.log is a generic error log that may contain some information, but avagent.log is the specific and most detailed log for agent communication.

1. Dell Avamar Administration Guide, Version 7.5, P/N 302-002-133, Page 599, Table 151 "Client logs": Describes avagent.log as the log for the Avamar client agent service, which listens for backup/restore requests from the Avamar server.

2. Dell Avamar Technical Addendum, Page 11, "Client Logs": States that avagent.log contains communication details between the client agent and the Avamar utility node (MCS).