This is a visual diagram of how computer discovery works in OpsMgr 2007. The list of prerequisites required to discover servers and install an agents are listed below as well:

 

Description: RPC endpoint mapper

Port number: 135

Protocol: TCP/UDP

 

Description: NetBIOS name service

Port number: 137

Protocol: TCP/UDP

 

Description: NetBIOS session service

Port number: 139

Protocol: TCP/UDP

 

Description: SMB over IP

Port number: 445

Protocol: TCP

 

Display Name: Netlogon

Started: True

State: Running

 

Description: MOM Channel

Port number: 5723

Protocol: TCP/UDP

 

Display Name: Windows Installer

Started: True

State: Running

 

Enable: File and Print Sharing

Steps on how to enable F&P can be found here: http://technet2.microsoft.com/windowsserver/en/library/0cf7e1a7-f7a2-49f9-8fee-730d9d1ea2071033.mspx?mfr=true

 

Enable: Remote Administration Exception

Steps on how to enable Remote Admin can be found here: http://technet2.microsoft.com/windowsserver/en/library/b8057a7a-a0d3-40b5-8224-ea6a4f5e17231033.mspx?mfr=true