Check NRPE working with two servers, and not a third?

[Mr Gabriel]

On my nagios server I get

C:\ Drive Space;UNKNOWN;HARD;3;CHECK_NRPE: Received 0 bytes from daemon. 
Check the remote server logs for error messages.

On my windows box I get the error messages

NRPE_NT:  Client request was invalid, bailing out...

Which would suggest based on my research that the problem is 
misconfiguration, yet the same setup works with other servers already, 
so i know the server is capable of communicating with a windows setup.

What could cause this to be the case?

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