您好，
在WDS服务器和防火墙上，必须打开下面的UDP端口：
Port 67 (DHCP)
Port 69 (TFTP)
Port 4011 (PXE)
下面是一篇WDS的工作流文章，请观察您到了哪一步？
Workflow of WDS.
https://blogs.technet.microsoft.com/sunshine/2015/05/16/workflow-of-wds/
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