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This entry has been published on 2014-07-28 and may be out of date.

Last Updated on 2014-07-28.

Older Mainboards seem to have a problem with the TFTP block size setting.

When you try to boot the image via PXE, you see the white status bar filling up, but suddenly the error appears: “0xc0000001, a required devices isn’t connected.”

In Windows Event Log, you might see event ID 4101 with error code 1460, source Deployment-Services-Diagnostics.

I tried several hints from various forums with no success.

In the end, the solution for me were the following steps:

  1. Open WDS
  2. Right-click your server in the left pane and open properties.
  3. Open tab “TFTP” and change the maximum block size to e.g. 1024.
  4. Restart your WDS server.

You might have to experiment with the block size value. In my case, it first didn’t work with 1024, but on the second try it suddenly worked and Windows Setup was able to boot.