Completely disable the Firewall on the VSP that's performing the Node Rescue... Login to the VSP with:
Username = 3parcust
Password = 3parInServ
Then I think it's Option 2, Option 3 and then the Option to "Turn Off Firewall"
Enter Node Rescue IP address details manually at Whack Prompt as instracuted by the VSP:
net addr x.x.x.x (give this node an IP address on the same subnet as the VSP)
net netmask x.x.x.x (same netmask as the VSP)
net gateway x.x.x.x (same gateway as the VSP)
net server x.x.x.x (IP Address of the VSP)
boot net install ipaddr=(net addr IP Address your set above) nm=(net mask you set above) rp=(net server address you set above)::rescue
Hit enter and it should start downloading the 3PAR InformOS you mounted to your VSP, from your VSP