[This message was posted by Paul Raskin of RJ O'Brien <[email protected]> to 
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Hi Russ,

The following is from the FIX.4.4 spec 
(http://fixprotocol.org/specifications/FIX.4.4, volume 2, page 29):

"If during a Logon one receives a second connection attempt while a valid FIX 
session is already underway for that same SenderCompID, it is
recommended that the session acceptor immediately terminate the second 
connection attempt and not send a Logout message. Sending a Logout
message runs the risk of interfering with and possibly adversely affecting the 
current active FIX connection. For example, in some FIX system implementations, 
sending a Logout message might consume a sequence number that would cause an 
out of sequence condition for the established FIX session."

- Paul

> Hi All,
> 
> I'm curious as to the correct way a FIX engine should respond to the
> receipt of a logon from a peer that collides with a session that is
> already active from a different peer - should the engine send a response
> message (with a default sequence number) or should the engine simply
> disconnect with no response to the offending client?
> 
> Thanks,
> 
> Russ


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