GEN005260 - X Window System connections not required must be disabled.

Information

If unauthorized clients are permitted access to the X server, the user's X session may be compromised.

Solution

Disable the X Windows server on the system.
Comment out /etc/rc.dt out of /etc/inittab

See Also

https://iasecontent.disa.mil/stigs/zip/U_AIX_6-1_V1R14_STIG.zip