If your desktop Windows XP PC is running the new XP SP2 Windows Firewall you
will need to configure the firewall to allow ActiveSync.
http://www.cewindows.net/faqs/activesync/windowsxpsp2firewall.htm
http://ogasawalrus.com/mobileviews/mobilefaqs/ActiveSync
Troubleshooting the Windows Firewall settings in Windows XP Service Pack 2
http://support.microsoft.com/default.aspx?scid=kb;en-us;875357

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Al Jarvi (MS-MVP Windows Networking)
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>I upgraded to SP2 and AS3.8 after that my iPaq refuses to sync and AS is
> telling me that I need to remove the cable and turn off my PPC. The
> computer
> sees PPC just fine. Any ideas?
Dima - 29 Jun 2005 20:54 GMT
I turned off all the firewalls, and still cannot connect. Any other ideas?
> If your desktop Windows XP PC is running the new XP SP2 Windows Firewall you
> will need to configure the firewall to allow ActiveSync.
[quoted text clipped - 11 lines]
> > computer
> > sees PPC just fine. Any ideas?