防火牆的問題可以參考微軟網頁的設定
http://www.microsoft.com/windowsmobile/help/activesync/default.mspx
裡面有防火牆的設定方法.
Desktop Firewall Applications
Sygate Personal Firewall
TrendMicro PC-cillin Internet Security 2005
Norton Personal Firewall
Zone Alarm Security Suite
McAfee Personal Firewall
Windows Firewall
後來我重新安裝了 ActiveSync 4.5 beta 2, 就沒這個問題了..供大家參考參考~
ActiveSync 4.5 beta 2