I have a Member Server of an AD domain.I used this server before with ISA 2000 and was able to browse my network and add Global Groups from the AD domain to the local groups of this Member server and asigned rights to it.
Since I have installed ISA 2004, there is not connectivity with the AD domain. I am aware of under System Rules severals of those contains policy definitions for this kind of access.
Do I have to create a Firewall Rule for this access?
From your post I read that you were running ISA server 2000 on a member server , adding groups and users to this ISA server from the DC's ? And now you upgraded and no longer have access to the DC ? I would look in the Network rules ( not firewall rules ) from the LOCAL HOST to the INTERNAL NETWORK and put it on ROUTE instead of NAT. Then make firewall rule of ALLOW all administrators all IP traffic all destinations to test. Then if it works you know you can solve it and need to remove the rights. Then gradually increase security until it works ( or look up the correct port numbers )