I just installed a brand new cluster on FAS8040 running 8.3RC2. I ran config advisor etc and the cluster has been installed perfectly. I do however find that the management ability .i.e. browser as well as via ssh stops working randomly. It still responds to ping requests but I cannot access it at all during this period.
Solved. In my case, it was a duplicate IP address on the network. Changed the cluster management IP to an actual free IP on the network and the connection stayed rock solid throughout -- SSH and browser and all.