Can you telnet port 3389?

I, too, am having a similar problem. I have two XP computers (SP2 and
otherwise fully patched) on the network and I access the second one
regularly using RDC. This worked fine under RDC 5.x and 6.0.1000.
However, recently it became problematic. I've tried the suggestions
here to no success (yes, I can telnet to the port and ping the
machine). I, too, get no event viewer log entries, but I do get an
error message in the client. Below I describe the various symptomatic
results.

Even after a reboot of the REMOTE computer, I try to connect to it,
but it generally won't connect. Sometimes it will. After I login to
the REMOTE computer using the login name I connect with remotely, then
I can get the login box. Maybe. Then it may work for awhile. Or it may
not.

Every time I connect, I get the black screen first. When it works,
after a few seconds, I'll get the login screen. When it doesn't I get
this dialog box:

- - Remote Desktop Disconnected - -
Your Remote Desktop session has ended.
The connection to the remote computer was lost, possibly due to
network connectivity problems. Try connecting to the remote computer
again. If the problem continues, contact your network administrator or
technical support. (buttons: OK, Help)

I also sometimes get a message that it's trying to reconnect and it's
always attempt #1 of 20.

I've tried entering my password before connecting and waiting to enter
it after connecting. That doesn't seem to matter.

A reboot of REMOTE "fixes" the problem temporarily. Usually. It
appears to connect and try, but then times out or something.

If I connect without specify the password up front, I do connect to
the computer and it gives me the login box. I can even see it begin to
draw the screen. But before the desktop is fully engaged, usually
before I see the white background of a window, it fails and starts
again.

It may have something to do with the screensaver timeout maybe because
it seems to only happen after a long time left connected and letting
my LOCAL computer go to screen-saver. Interestingly, too, if I then go
to the REMOTE machine and try to logon locally (using the welcome
screen -- the one that lists all the local users) it never actually
logs in but rather loops back around to the welcome screen. I even
tried logging in this way once about 50 times to no success. The only
way to "fix" this is to reboot the computer from the welcome screen
(terminating any open apps, etc).

I've tried using both full screen mode as well as non-full screen
mode, but it doesn't seem to matter.

I've turned off firewalls and anti-virus for testing purposes but that
doesn't seem to affect the results. Also, I've not changed firewall
nor anti-virus software (Comodo and Avast, currently) which was in use
before this all started.

Started with 6.0.6000, updated to 6.1 (which shows as 6.0.6001). I did
have the settings to a modem connection and changed it to a LAN
connection, but that's only to control the amount of data passed.
Network traffic is minimal, connected via Intel 510T switch (yeah,
old, but a workhorse).

Still looking for a solution that doesn't require me to walk to the
far end of the building to access the computer I used to access
remotely quite easily for days/weeks on end without reboot needed.
Sigh.

Thanks,

Mark