How to disable GUI from dispalying from CentOS to X server (XManager 3)

i have a RAC system installed and normally login to both boxes remotely using my laptop, at some point i wanted to install the listener using a GUI so i decided to use XManager3 but had problems connecting, so i decided to install the listener on the box itself but now i have a problem because when a run the netca command i get an error
Error:#
xlib: connection to "0.0" refused by server
Xlib: No protocol specified
java.lang.NullPointerException
at oracle.ewt.lwAWt.BufferedApplet.<init>(Unknown Source)
at oracle.net.ca.NetCA.<init>(Unknown Source)
at oracle.net.ca.NetCA.<init>(Unknown Source)
Oracle Net Services configuration failed. The exit code is -1
how can i disable X server on my host, because the problem is, when i run the netca command on my host (linux1) it is looking to display it on the X server whereas i just want it to display the GUI from the host console

oh my, another X question.
setup an X server on your local machine (like Xming) or use MAC or linux, and use ssh -X to tunnel X.
the ssh daemon will arrange the DISPLAY, no manual intervention is needed after logging in using ssh -X.

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