I don't want to migrate to v7 just yet, especially on the older XP machines, but let me explain how i managed to fix the activation issue.
I took all the policies, one by one, to verify the exact changes they implement and i discovered that in the default "HTTP Proxy Usage" policy, it was entered the old ip of the previous server, both for the Management Agent and security product, so i changed that old lan ip to the new one, re-send the activation task and the red marks were gone instantly
I want to thank you for the help provided, taking it step by step helped me to fix this issue, it was very helpful to write this topic, having all these things written here really helped!