Answer to why I couldn't CONTROL a Mac

My upgrade to ARD 3 provided some insight as to why I could OBSERRVE but NOT CONTROL a particular Mac, which happened to be across two NAT routers -- even after doing port forwarding AND turning off the firewall.
The new ARD 3 told me that another incompatible VNC server was already running.
Well, I knew my client had experimented with "OSXvnc", but I didn't think ti was a running app. Not in the dock. Not a login item.
HOWEVER -- once we ran the app we saw it had its OWN startup prefs! Once we disabled those, BINGO! I could FINALLY control this Mac across the NAT routers.
ARD 2.2 gave an error, but the error was something like "you don't have permission to control this client". Even Apple Tech Support was stumped, sugesting re-installing the 2.2 client.
Of course, after upgrading the admin to ARD 3, I had to upgrade the client to ARD 3 client -- but I could do that with one menu command.
And then -- IT WORKED!
I hope this'll help others...

Thanks for asking!
NO -- no one has replied to this message (the one below) and I still have that problem of turing on the firewall cutting off ARD completely.
Do you know anything about it?
Stephen
===========================
My transition to ARD 3 has been quite smooth (though I'm only controlling 3 Macs, 2 across NAT routers and one behind the router).
However, once everything was working at the client end (he's ehternet connected to an Airport Extreme which is connected to his cable modem) I got a wee bit too confident and turned his firewall BACK ON (in the Sharing panel). Once I closed my session I could no longer observe or control the client -- until he STOPPED THE FIREWALL again.
I looked at the firewall log (ipfw.log) and saw some odd ports being blocked (I've obscured my actual IP address here with xx.x.xx.xxx):
ifpw: 12190 Deny TCP xx.x.xx.xxx:50988 10.0.1.2:5900 in via en0
I'm not familiar with a 5 digit port, but in any case I don't think 50988 is a port which I would have thought to open.
What's interesing is that each time I attempted the connection, the cleint's log showed a DIFFERENT inbound port denied:
ifpw: 12190 Deny TCP xx.x.xx.xxx:50990 10.0.1.2:5900 in via en0
ifpw: 12190 Deny TCP xx.x.xx.xxx:50991 10.0.1.2:5900 in via en0
ifpw: 12190 Deny TCP xx.x.xx.xxx:50992 10.0.1.2:5900 in via en0
ifpw: 12190 Deny TCP xx.x.xx.xxx:50997 10.0.1.2:5900 in via en0
This looks a bit like more undocumented magic?

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