Microsoft KB Archive/259670

= PXE clients computers do not start when you configure the Dynamic Host Configuration Protocol server to use options 60, 66, 67 =

Article ID: 259670

Article Last Modified on 10/30/2006

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APPLIES TO


 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q259670



SYMPTOMS
When you try to start a Pre-Boot Execution Environment (PXE) client computer, you may receive one of the following error messages:

No reply from Server

TFTP download failed

No boot Filename Received

PXE-E55 Proxy DHCP Service did not reply to request on port 4011



CAUSE
This issue can occur when the DHCP server has the following Dynamic Host Configuration Protocol (DHCP) options set:
 * #60 = Client Identifier (set to &quot;PXEClient&quot;)
 * #66 = Boot Server Host Name
 * #67 = BootFile Name

When the initial DHCP offer from the DHCP server contains these boot options, an attempt is made to connect to port 4011 on the DHCP server. This offer fails if the PXE server is on another computer.

Important: Microsoft does not support the use of these options on a DHCP server to redirect PXE clients



To resolve this issue, you must remove these options from the DHCP server and configure the routers IP helper table to contain the IP address of the RIS server.



MORE INFORMATION
This issue can affect any kind of PXE server including Automated Deployment Services (ADS).

For a PXE server to respond to a PXE request, the request must be able to transverse routers to communicate with PXE servers on other subnets. PXE uses the DHCP option fields to pass information. Therefore having the PXE server in the routers IP helper table helps make sure that the DHCP packets are forwarded to the PXE server so the PXE server can respond correctly.

PXE uses the following to determine which offer to use:
 * DHCP/Bootp in same offer
 * DHCP with IP only Proxy Boot Servers, such as Remote installation services (RIS) and ADS.

