We have (X) on connection dialog box which can close the dialog box.
When you close it with (X) on connection dialog box, and start using connection again,
it doen't show connection dialog box. Which is next

How to reproduce this.
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1) logon to solaris-sparcv9 machine.
2) start jconsole.
3) it opens with connection dialog box.
4) click on close(X)
5) It closes the connection dialog box
6) start using Connection->NewConnection

It doesn;t return back with new connection dialog-box.
or it doesn;t show any hidden connection dialog boxes.

Please open the step-1.png file, which shows a connection dialong box. Then please flow from step(4), you will this could be very well and easily reproducable.
Please see below entry
Please see below entry