Issues booting two iSCSI targets simultaneously.

[robinsmidsrod]

You need to figure out which component of your stack is at fault. Is it ipxe, your iscsi target (windows server), your iscsi initiator (windows 7) or some network issue. iPXE can be debugged using e.g. syslog logging which should help you figure out how far it gets. Windows bootup can be debugged using windbg (don't ask me how). Network traffic can be monitored using Wireshark. Windows iscsi target I have no idea how to debug. Check MS documentation. Once you've gathered enough information to understand which component is failing then we might be able to help you out. Please share the information that allowed you to figure out how you got to your conclusion.

If you're willing to pay for support there is a vendor contact on ipxe.org you could try to get in touch with.