I found an issue where quickfixj always stopped at my windows server 2008 without any quickfixj error logs. Just like heartbeat last min normally, however, suddenly stop right now, and the broker side confirmed no issue in their side.
I'm suspecting it's a server issue, rather than a quickfixj issue, but not confirm. So checking if you encountered similar issue before?
I'm running the version1.6.3.