How to solve hang after windbg connect?

Dear Sir:

        I have some questions about setup windbg.

        I would download and install "WindowsXP-KB835935-SP2-
Symbols.exe" on my Host PC

        I try to connect both XP-SP2 PC to debug , but i found it
would run very slow or hang
        after show below message. I also can't control target pc and
don't type any commands,
        like "bp or bl". (show *BUSY*)

        How do i do to solve this condition?

//------------------------------------------------------------------------------
-----------------------------------------------------------------------//
Microsoft (R) Windows Debugger Version 6.8.0004.0 X86
Copyright (c) Microsoft Corporation. All rights reserved.

Opened \\.\com1
Waiting to reconnect...
Connected to Windows XP 2600 x86 compatible target, ptr64 FALSE
Kernel Debugger connection established.
Symbol search path is: C:\WINDOWS\Symbols;D:\Driver\XP
\2028\objchk_wxp_x86\i386;SRV*c:\WebSymbols*http://msdl.microsoft.com/
download/symbols
Executable search path is: D:\Driver\XP
\2028\objchk_wxp_x86\i386
Windows XP Kernel Version 2600 UP Free x86 compatible        <===
spend more than 3 mins to show this
Built by: 2600.xpsp_sp2_gdr.070227-2254
Kernel base = 0x804d8000 PsLoadedModuleList = 0x8055b620
System Uptime: not available