[This message was posted by Saikiran Ramesh of Ace Consulting 
<[email protected]> to the "4.0 Session" discussion forum at 
http://fixprotocol.org/discuss/12. You can reply to it on-line at 
http://fixprotocol.org/discuss/read/1639cf53 - PLEASE DO NOT REPLY BY MAIL.]

so basically its gives u rudimentary sort of validation. isn't it possible for 
someone to sniff the sessionID and then disguise as that party. it is my 
assumption that the communication is usually over a VPN based networks and not 
really over the www. bcoz i am not sure how this is secure.

> Hi Sakira,
> 
> The theory behind this is for the initiator to check if the connection
> is up(if this is the first connection with the acceptor for the day),
> the initiator will expect a sequence 1. Yes it is a low level socket
> acceptance.The logon message must be the first message sent by the
> application requesting to initiate a FIX session. There are few tags
> there but as far as I know there should be Tag 108, 95,96, 98. Upon
> receipt of a Logon message, the session acceptor will authenticate the
> party requesting connection and issue a Logon message as acknowledgment
> that the connection request has been accepted. The acknowledgment Logon
> can also be used by the initiator to validate that the connection was
> established with the correct party.
> 
> 
> Check this http://www.transacttools.net/ttportal/datadict/browser.jsp
> it may help.
> 
> Joel
> > i am looking the examples given in quickJ and i am sort of confused.
> > can u confirm my understanding of session creation, logon
> >
> > - initiator first initiates the connection. my question is what
> >   information is sent here. [in other words what tags]. is this just
> >   the low level socket acceptance between initiator and the acceptor?
> > - why is the session established first and then the logon [35=A]
> >   established second. does the session id needs to change bcoz i dont
> >   think u can use same session id before authentication


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