I'm sure that others have come across the same error message and may have been able to resolve it, but since I'm new to SCCM and had to work my way through this error I thought that I'd share. So I've been PXE Booting and deploying Windows 7 now for over a month on different model machines and so I know that our SCCM setup was correct and one day I come a cross a new Dell Optiplex 780 out of the box that just would not boot. I kept getting the "PXE-E55 ProxyDHCP service did not reply to request on Port 4011" error. All of the bios settings to allow for PXE were set and the machine would boot into PE from a Flash drive of a CD but not from the PXE server. The bios level on the machine was A01 and I upgraded the bios to the lates level for that model which was A08 and AutoMagically the machine boots from the PXE serve as it should. So the next time you get this error and you know that everything is setup correctly, try flashing the bios.
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I'm sure that others have come across the same error message and may have been able to resolve it, but since I'm new to SCCM and had to work my way through this error I thought that I'd share. So I've been PXE Booting and deploying Windows 7 now for over a month on different model machines and so I know that our SCCM setup was correct and one day I come a cross a new Dell Optiplex 780 out of the box that just would not boot. I kept getting the "PXE-E55 ProxyDHCP service did not reply to request on Port 4011" error. All of the bios settings to allow for PXE were set and the machine would boot into PE from a Flash drive of a CD but not from the PXE server. The bios level on the machine was A01 and I upgraded the bios to the lates level for that model which was A08 and AutoMagically the machine boots from the PXE serve as it should. So the next time you get this error and you know that everything is setup correctly, try flashing the bios.
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