DHCP configuring error 0x40ee186

[Richard_Compal]

Hello all,
i am a new person for iPXE, and now i meet a question when i build snponly.efi for UEFI boot, i download the source and rebuild snponly.efi, when the NB boot to ipxe, run dhcp command, it feedback bellow info,

iPXE>dhcp
configuring (net0 01:01:01:01:01:01)...... Error 0x40ee186 (http://ipxe.org/040ee186)
iPXE>ifstat
net0: 01:01:01:01:01:01 using NII on NII-PC08:00.0(closed)
Link:down, TX:0 TXE:0 RX:0 RXE:0
Link status: Unknow(http://ipxe.org/1a086194)]

1. i build the Win2012 DHCP server with VMware, it will show this error.
2. i don't use VMware build DHCP server, and use a server build DHCP, will no this issue, but initrd file by HTTP, the speed very slowly.
3. use other's guys build snponly.efi, use VMware build DHCP, also no this issue, initrd file speed normal, and i cannot use it, because i need chainload my php file.

anyone can help me? many thanks,
sorry for my english very poor.