Hello I am running the Aruba3600 on software 6.4.2.12 - everything works fine. I have a windows 200R2 network with clients authenticated by a Windows Server and then assigned an IP by the same Windows DHCP server. My problem is that each time I upgrade to any operating software above 6.4.2.12 at least half my clients start to experience problems receiving an IP address. The moment i roll back to 6.4.2.12 everything is fine again???