I'm having trouble deleting site-to-site VPN. Both sites have ISA 2006 and somehow at my HQ site remote network ended up in my system firewall rules ( rule 14 and 15). Since remote network is defined in the rule it doesn't allow deleting site-to-site and consequently deleting remote network. When I want to remove this network from the system policy rule 'Allow VPN site-to-site traffic to ISA Server' from/listener list it is grayed out.
By the same token system policy rule 15 'allow vpn site-to-site traffic from isa server' has the same network and it cannot be removed either.