Deploying Windows 7 using MDT 2010

PXE-E32: TFTP open timeout

Suddenly over night my WDS deployment system stopped working. Booting from DHCP was OK, the IP address looked fine. But the PXE died with the error described above.

It turned out that if WDS and DNS are installed on the same machine, they might by a chance occupy the same range of 2500 random UDP ports. This renders one of those services completely inaccessible.

The following command fixes this:

wdsutil /set-Server /Transport /StartPort:50000 /EndPort:65000

Or setting the UDP port range from the WDS management console to wider range than 2500.