Trying to get Incoming Remote command to work in XP

I'm running into a problem getting the Incoming Remote command to work in XP.

I have it working fine in '98 so I know the AS/400 side is setup correctly.

I have tested port 512 with Port Detective and it says it's blocked. Port
Detective test the port from the PC to the outside world. I have put an
exception in the windows firewall to allow port 512 and to allow the program
cwbrxd.exe. I have also turned off the windows firewall.

I have turned off the Client Access Express Remote Command service and checked
to see if any other programs were using port 512 with a program called Active
Ports. It shows nothing is using port 512.

I have checked with the ISP Road Runner in Southern California and they say
they don't block any ports.

In XP sp2 I have setup a user with Administrative Rights that the Remote
Command is using with the password in all upper case.

In services for "Client Access Express Remote Command I have set the Log On to
use the same Account as the User that the remote command is using with the
password in all upper case.

I have added the user in Control Panel, Administrative Tools, Local Security
Policy, User Rights Assignment:

Act as part of the operating system
Create a token object
Create permanent shared objects
Increase scheduling priority
Log on as a batch job
Log on as a service
Log on locally
Replace a process level token

I have taken the remote command and run it from a command line with the same
user. It runs fine.

I have tried logging in under the same user and running the Remote Command. It
hangs.

I am not getting any error in V4r4 running Client Access Express V5r1 with the
latest service pack. The system is waiting on a timed wait.

I can understand it not connecting with port 512 blocked. I can't understand
what is blocking port 512 unless Road Runner isn't giving me the true scoop.

I have also tried this on a different ISP - Megapath.net. Port 512 is still
blocked.

What else could be blocking port 512 in XP?

Thank you,

Gary Kuznitz