{{Quickfixn}} Unable to Connect

[Amar Parmar]

Hi,
At the moment, in my FIX.4.2-**.event.current.log file I am getting:
20141006-11:34:51.866 : Connection failed: An invalid argument was supplied
I'm not sure how to check what exactly is invalid.
This setup was working the last time I used it a few months ago.
Does anyone have any suggestions to debug this?
Thanks,
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