Working on a SBS system that involved a Sing Migration. On the new machine when we ran the Connect to Internet Wizard we received a failure on the firewall configuration. When we looked at the logs we saw :
error 0x8004020f returned from call to sending RUP intro mail()
After some searching it appears that error was DNS related.
Turns out that we are changing the server from a 2 NIC configuration to a single NIC configuration and there were still some entries for the old external IP address ins some of the DNS zones. Once we removed there and rebooted the wizard ran fine.