[This message was posted by John  Peng of IIROC <[email protected]> to 
the "Transport Independence Framework" discussion forum at 
http://fixprotocol.org/discuss/49. You can reply to it on-line at 
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I am wondering what would you expect a FIX engine to react when an "uninvited" 
SequenceReset/GapFill comes in -- with no actual sequence gap and no 
ResendRequest?

To be more specific:

A: Logon(1)
B: Logon(1)
A: Heartbeat(2)
B: Heartbeat(2)
A: Heartbeat(3)
B: Heartbeat(3)
A: ResetRequest/GapFill(1->2)

What would B do at this time?

I tend to assume that the ResetRequest/GapFill(1->2) from A is harmless though 
not expected, and B should be able to handle it (i.e. ignore it).

However, some FIX engine would disconnect the session complaining tthat 
"attempting to decrease sequence number from 4 to 2".

What's your opinion?  Thanks.





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