[This message was posted by Chirag Patel of Tradeweb LLC <[email protected]> to the "General Q/A" discussion forum at http://fixprotocol.org/discuss/22. You can reply to it on-line at http://fixprotocol.org/discuss/read/8148b77d - PLEASE DO NOT REPLY BY MAIL.]
> > > 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. > > > > Hi Paul, > > > > Thanks - that's pretty much what I thought, but I had received an > > email from someone who wasn't happy with QuickFix doing that so I was > > wondering if other engines were doing something different. > > > > It would be nice if FIX included an informational message type that > > could be used in these situations, e.g. one where the sequencer > > number was not relevant. It seems there are several situations > > where receiving a response message would be beneficial to the > > connecting system. > > > > Cheers, > > > > Russ > > I agree wholeheartedly, Russ. It is completely unclear to the third > party in this scenario as to why logon messages sent are unanswered. It > would be much more helpful in diagnosing the root cause for that party > if at least some message were sent, even if it were just an admin-level > reject versus a logout message. If the FIX engine were smart enough, it > wouldn't up the sequence number for that session if it were already > active when it received another logon request and it decided to send a > notification to the third party. Just my two cents. > > - Paul FIX connectivity may not always be on private lines. If it is an anonymous user/hacker who is trying to connect, it is worth not sending anything back but simply drop the connection request. My 2 cents. -Chirag [You can unsubscribe from this discussion group by sending a message to mailto:[email protected]]
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