jinfo intermittently fails with 'Connection refused' message on some UEL 6 hosts:

>$JAVA_HOME/bin/java -d64 Test &
>PID=$!
>sleep 5
>$JAVA_HOME/bin/jinfo -J-d64 -flag PrintGC=1 $PID
9317: Connection refused

Issue could be reproduced with JDK 7 FCS as well as with JCK 7u10-b12.
I've attached script that could be used to reproduce issue. However it could take a lot of time to reproduce issue, but on some machines it could be reproduced quickly.

See comments for more details.