NBU7.5 Java GUI hung on jumpserver

We are in phase of moving the NBU 7.5 java console to other server where we are having NBU7.1 java console as the current NBU7.5 server getting decomission.

Both javaconsole has been installed on the server and 7.1 GUI works fine, but on 7.5 while we logging to GUI it got connected to master but from the GUI appears it got hungs, I am not able to click, it show for some time and displays the message pop-ups as application not responding.

Master server version: NetBackup 7.5.0.5
 

Note:

The NBU7.5 master is in different VLAN

Is there any thing that need to be work on the network or on the jump server for this issue?