Virtual System - Problem logging in

I've installed a second virtual system on o rhel5 server but I'm having 
a problem registering it. The installation continues up to the point 
where I'm asked about software updates and I choose to register the system.

After providing the rhn login/pass I get: "There was problem logging in" 
(a different message from the one where you put wrong password - 
account/pass not valid - so it's not a password problem).

I can login via web and I can update the other systems (including the 
first virtual system running in the same system).

Also, on rhn in the system listing I see the system under "Virtual 
Systems" but it's grayed out and has no Channel associated with it.

I don't think is a entitlement problem ether. There a 4 virtual system 
limit per machine and this is the second, plus I have 2 more 
entitlements available.

I found nothing on the logs about the logging problem and it has been 
some time since I installed the last Virtual System, so, I might be 
doing something wrong here... but I can't find out what.. any help?

Thanks,
   -N.