Hi,
SQL Agent uses Microsoft NetBIOS (use "net use") to connect to the ADMIN$ if the connection is successful then DB Agent will use RPC (Remote Procedure Call) to communicate with the server.
Please NOTE: RPC is on top of TCP/IP. So SQL Agent just uses the top layer to do the connection, it lets RPC does all the work. So the bottom line is the ADMIN$ must be visible in order for SQL agent to work correctly.
We could try the following:
1.control panel >>networking>>>TCP/IP
properties
advanced
wins
enable NetBios over TCP/IP
2)set the following registry key on the server where the SQL agent is installed
HKLM / SOFTWARE / COMPUTERASSOCIATES / BRIGHTSTOR ARCSERVE BACKUP / DSAGENT / CURRENTVERSION / AGENT \ UseTCP = 1
3) Go to the discovery table of the BAB server and see if the remote machine is listed there or not. If not listed, see if the discovery service is able t o locate the remote machine. If it isn't try to add the remote SQL machine to
the discovery table of the BAB server
4) Check for the following ports are open or not(Both tcp/udp).It should be open
TCP/139 - SQL agent
TCP/6071 - Agent RPC Service
TCP/6070 - Agent Remote Service
TCP/6050 - NT Client agent
4. Use the rpings and rpingc utilities to test RPC connectivity. This article
refers to Exchange 2000, but actually these are general rpc connectivity test utilities, so you don't really have to have Exchange installed.
Restart the backup agent rpc service once these suggestion are performed.
Cheers