ARD Not Active

I have recently begun to have the same problem.

I have a computer I work with that just began to return these indicators:

When first turned on, "Access Denied" and after a time, it switches to "ARD not active." I have checked both in person and by having the person on site check to see that none of the shortname/passwords have been changed. We have also tried restarting the cable modem and router.

This setup has worked for over a year, and now it is impossible to connect with. I had someone bring in their personal iBook and hook it up to the network. I was able to 'see' (list the computer in ARD, but they were running an older version of the Client so I was unable to "Control") their computer as well as access their HD via "Connect To Server." Even after that, I was still unable to connect the original computer.

Assuming nothing has changed since I was last able to connect, what should I try?

The remote computer:
G4/400MHz Running OS X 10.3.9 (with the updated ARD Client)

My computer:
Dual 2G/G5 Running OS X 10.4.5 (with ARD 2.2)

Just an update.

I had the remote site Uninstall ARD and then re-install it. Now I can't even see (have the computer come up on the ARD list) it, let alone access it.

We also ran Disk Utility to repair permissions.
Thank you.
wms out.

Make sure that all computers on your lan continue to use the same lan ip address from your router. Many routers will dynamically assign these addresses but some will also statically assign. Without the static assignment, the Macs in question may be getting assigned a different address than the one setup in ARD. Alternatively, you could also re-add the computer with it's new lan ip address. Port fowarding in a router is also important, making sure that the router is fowarding the ARD commands to the right Mac through the right ports.