BINDLSVC error 522 from WDS

If you are getting BINDLSVC error 522 errors in the event log when attempting to boot systems into WDS you may have a bad config in AD.

Normally this is because when setting values to the netbootMirrorDataFile attribute on the computer object the ; (semicolon) at the end of line may be missing.

From MSDN:

netbootMirrorDataFile: This attribute is used to store multiple values in the following format:
<key-1>=<value-1>; <key-2>=<value-2>;...; <key-N>=<value-N>;