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hp z220 pxe boot fails e51

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HP Z220
When booting over the network HP z220 I get the error pxe-e51. although MS AD everything is OK, on another machine, z200 all goes well. Connected to the same switch. I tried on a pair of supermicro servers, also all is loaded. It is unclear why, after downloading your network card gets DHCP address fine. What could be the problem?
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I had this problem on a newer HP and found that PXE wasn't running long enough to get assigned the IP address. I found a place in the bios to extend the time to allow it to complete the process and then all worked fine. If you find it, document it because I am out looking for it again. If isn't easy to find in the BIOS

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