every VNC version after 1.3.8.1 has a problem with query window not displaying viewer message properly.
When you add custom message as shown in screen below:

It doesn't show up at server query window, all you can see is accept_reject_mesg from ini file and ip adress.
My message is only visible in pop up window in right bottom corner after user accepts connection.
Edit: Problem must be in newer servers, when you try to connect from 1.4.3.1 viewer to 1.3.8.1 server everything works as expected.