ipxe not booting 2nd stage of windows 7 install correclty -- please help!

[robinsmidsrod]

Most likely you have the same problem most other people have with Windows and iSCSI, that your router is not routing packets back to the local network, and the Windows iSCSI initiator (client) has a bug that it doesn't talk directly to the iSCSI target server, but always go via the default gateway.

You can avoid this problem by using the command set netX/gateway 0.0.0.0 just before the sanhook/sanboot command in your iPXE script.

Alternatively you have your iSCSI target service setup to only allow a certain initiator IQN, and when you start Windows it'll take over and use another initiator IQN than iPXE. If you try to do a packet capture (http://ipxe.org/howto/pcap) you'll probably see a failed iSCSI login with the Windows-based initator IQN. Adding the Windows initiator IQN to the iSCSI target's access list should probably solve that problem (if it is indeed your problem).