Although SMS 2.0 departed from the User Datagram Protocol (UDP) as the default protocol (in favor of TCP/IP), you can still specify the UDP protocol on client computers. To use UDP as a protocol, you must change the User Settings key in the registry as follows.
\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SMS\Client\Client Components\Remote Control\CommandLine = "-IP"
Permitted settings for the CommandLine key are:
-TCP = TCP/IP protocol
-IP = UDP
-IPX = IPX
-Lx (where x = LANA number 0-7) = NetBIOS listening on LANA number x
Even if you modify the registry to force UDP to be the default protocol, you should not have any problems connecting to the client computer from the SMS Administrator console. When SMS attempts to connect to a client computer, it sends signals across all known protocols (TCP/IP, UDP, IPX, and NetBIOS LANAs), and responds using the protocol the Remote Control Client Agent returns a signal on.