Its possible the OneCare product is causing this. See this thread from
another person with a similar issue...

http://www.broadbandreports.com/forum/remark,14782948

You might report this as a possible bug to the OneCare Beta folks at MS...

--

Al Jarvi (MS-MVP Windows Networking)

Please post *ALL* questions and replies to the news group for the mutual
benefit of all of us...
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rights...

"Gerhard" <Gerhard@discussions.microsoft.com> wrote in message
news:C6D3A423-777F-4BE2-AE26-F8A71971820A@microsoft.com...
> Remote Desktop does not work, because Port 3389 is not open.
>
> Following
> http://theillustratednetwork.mvps.or...eshooting.html
> I checked : Remote Desktop is enabled, the right Remote Users are selected
> and the Exceptions tab for remote desktop is checked on Windows firewall.
> TsRdRxaminer confirms that Microsoft RDP is 5.1 version, listening port is
> 3389 and remote desktop is enabled.
> Cmd/ipconfig shows IP address as w.x.y.z.
> Can not connect to the host computer on the local Lan.
> I definitely know that the Port forwarding of TCP Port 3389 through the
> Link
> WRTP54G router works , because RD works when I change the hard drive.
> I reinstalled no-ip, it works.
> Security Event Viewer Log does not show the attempt to start remote
> desktop.
> Services.msc shows that Terminal Services is running.
> Cmd/ netstat -a shows PC is listening on TCP Port 3389.
> PortQryUI shows TCP port 3389 (unknown service): LISTENING
> portqry.exe -n 192.168.15.100 -e 3389 -p TCP exits with return code
> 0x00000000.
> But www.canyouseeme.org can not see port 3389, because connection timed
> out.
> Disabling all the protection programs on this computer: MS OneCare Beta,
> MS
> AntiSpyware, AVG and even the firewall did not help.
>
> What else could I check?
>
> Thanks in advance, Gerhard
>