subnets init using domain . failed using netboot

We have been netbooting accross subnets perfectly for the past year with the help of our network team. Now suddenly it stops working. The networking dept. says nothing has changed. In the netboot logs I get this:

server name: blast
subnets init using domain . failed.
bsdpd: re-reading configuration
bsdpd: shadow file size will be set to 48 megabytes
bsdpd: age time 00:15:00

When I’m on the same subnet it works fine and I don’t get any errors in the logs. Anybody have any ideas.

thanks