WSUS Clients don't show up on WSUS Server

Hello,

 I have installed WSUS 2.0 w/SP1, I followed all instruction, I
 configured Group Policy for AU client.  I ran the gpupdate /force on a
 couple of clients I also ran the command below on a client XP computer
 "everything seems to be correct",

 C:\>Reg query "HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate"
 /s ! REG.EXE VERSION 3.0

 HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
    ElevateNonAdmins    REG_DWORD       0x1
    WUServer    REG_SZ  http://emc1
    WUStatusServer      REG_SZ  http://emc1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU
    NoAutoRebootWithLoggedOnUsers       REG_DWORD       0x1
    AutoInstallMinorUpdates     REG_DWORD       0x0
    RebootRelaunchTimeoutEnabled        REG_DWORD       0x1
    RebootRelaunchTimeout       REG_DWORD       0x12c
    NoAutoUpdate        REG_DWORD       0x0
    AUOptions   REG_DWORD       0x4
    ScheduledInstallDay REG_DWORD       0x4
    ScheduledInstallTime        REG_DWORD       0x17
    UseWUServer REG_DWORD       0x1

 C:\>WUAUCLT.EXE /detectnow

 I also ran the tool ClientDiag.exe


 Checking AU Settings
        AU Option is 4: Scheduled Install . . . . . . . . . . . PASS
                Option is from Policy settings

 Checking Proxy Configuration
        Checking for winhttp local machine Proxy settings . . . PASS
                Winhttp local machine access type
                        <Direct Connection>
                Winhttp local machine Proxy. . . . . . . . . .  NONE
                Winhttp local machine ProxyBypass. . . . . . .  NONE
        Checking User IE Proxy settings . . . . . . . . . . . . PASS
                User IE Proxy. . . . . . . . . . . . . . . . .  NONE
                User IE ProxyByPass. . . . . . . . . . . . . .  NONE
                User IE AutoConfig URL Proxy . . . . . . . . .  NONE
                User IE AutoDetect
                AutoDetect not in use

 Checking Connection to WSUS/SUS Server
                WUServer = http://emc1
                WUStatusServer = http://emc1
        UseWuServer is enabled. . . . . . . . . . . . . . . . . PASS
        Connection to server. . . . . . . . . . . . . . . . . . PASS
        SelfUpdate folder is present. . . . . . . . . . . . . . PASS

 Press Enter to Complete

 But no computer is showing up on the WSUS Admin.  PLease let me know if
 you could help Thank you