The RepAgent user must have connect source permission for the Replication Server.
00:00000:00024:2006/06/23 14:44:45.12 server RepAgent(4): Received the following error message from the Replication Server: Msg 37024. CONNECT SOURCE permission is required to execute command.. 00:00000:00024:2006/06/23 14:44:45.24 server Error: 9261, Severity: 20, State: 0 00:00000:00024:2006/06/23 14:44:45.27 server RepAgent(4): This Rep Agent Thread is aborting due to an unrecoverable communications or Replication Server error. 00:00000:00024:2006/06/23 14:44:45.27 server Rep Agent Thread for database 'westRS_RSSD' (dbid = 4) terminated abnormally with error. (major 92, minor 61)