XenServer 7.0 iPXE errors downloading SCCM image

[NiKiZe]

(2016-09-15 15:27)dazzlr Wrote:  Filename: /smsboot/x64/wdsnbp.com... Error 0x3d126001 (http://ipxe.org/380f6001)

When I follow that link I see this:

Quote:This error indicates that a UDP packet was received for a port on which iPXE was not listening. This error is generally harmless. For example, DHCP requests sent by other clients on the same network may trigger this error.

Can you check that you are using the latest version of iPXE
and also try to run these commands manually:
dhcp
imgfetch ${filename}
imgstat

Are you running in efi or legacy mode for this? and have you tried any other virtual nic, such as e1000 or virtio (Not a xen user myself, but think those are available as emulated nics as well)