“Target Device boot fails with error PXE-E55 : ProxyDHCP service did not reply to request on port 4011"
The Option 60 is configured with the string "PXEClient". This is telling the DHCP Clients that the target of Option 66 is a PXE Client and not a PXE Server.
To resolve this issue, edit Option 60 and clear the field and restart the DHCP Server.
DHCP discover issue.