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  Reset Processing

  In all states except SYN-SENT, all reset (RST) segments are validated
  by checking their SEQ-fields.  A reset is valid if its sequence number
  is in the window.  In the SYN-SENT state (a RST received in response
  to an initial SYN), the RST is acceptable if the ACK field
  acknowledges the SYN.

So I think I'm correct in saying that there is no sequence number for
RST-ACKs but if it is RST then ACK must be set as well.  Interestingly
it appears that Windows 2000 accepts the RST even if the ACK bit is
not set.

Anyway thanks again for your helping me find the problem.

Jim

-- 
Jim Ockers, P.Eng. (ockers at ockers.net)
Contact info: please see http://www.ockers.net/