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X-Server access is denied on host

The situation is: I have a RHEL 7.3 VM that I am able to access via both ssh and VM console. I am able to run all of the standard commands for verifying that X11 forwarding/xhost permissions are working (xclock, nautilus, firefox, etc.) i can also run the runInstaller for Oracle client, No problems in any of these situations.
However, attempting to run the installation of Oracle WebLogic 12.1.3
with : cissys as user and the ligne command: java -jar fmw_12.1.3.0.0_wls.jar.
try with oracle user = same error.
results in the following :

Code:

Launcher log file is /tmp/OraInstall2017-07-25_03-14-27PM/launcher2017-07-25_03-14-27PM.log.

Extracting files.........

Java HotSpot(TM) Client VM warning: You have loaded library /tmp/orcl5779090421142529968.tmp/Disk1/install/linux/libjni.so which might have disabled stack guard. The VM will try to fix the stack guard now.

It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.

Starting Oracle Universal Installer

Checking if CPU speed is above 300 MHz.  Actual 1696.120 MHz    Passed

Checking monitor: must be configured to display at least 256 colors.  Actual 16777216    Passed

Checking swap space: must be greater than 512 MB.  Actual 7815164 MB    Passed

Checking if this platform requires a 64-bit JVM.  Actual 32    Passed (64-bit not required)

Checking temp space: must be greater than 300 MB.  Actual 2956 MB    Passed

Preparing to launch the Oracle Universal Installer from /tmp/OraInstall2017-07-25_03-14-27PM

Java HotSpot(TM) Client VM warning: ignoring option MaxPermSize=512m; support was removed in 8.0

Log: /tmp/OraInstall2017-07-25_03-14-27PM/install2017-07-25_03-14-27PM.log

X-Server access is denied on host

[Fatal Error] DISPLAY variable set incorrectly: 172.16.40.30:0.0

[Resolution] Verify that your DISPLAY environment variable is set correctly,

and that there is an X11 server on the system. If you are

running the Oracle Installer as a different user or on a different host,

you may need to use the xhost command to ensure that host/user

has permission to write to your display.

I've tried just about every troubleshooting step that I can think of and every troubleshooting step that Google has provided me.
If anyone has any idea of an obvious or less-than-obvious culprit, I would absolutely love to hear it.

Hi melghaze,

Welcome to LQ!

edit ...

Quote:

The error message received references the lack of a defined DISPLAY variable, the OUI (Oracle Universal Installer) does not know where to send output to and thus fails.

To resolve this issue simple set your DISPLAY variable to the local host or client machine you are currently using. If using a remote machine you will need a tool to accept the output from your server: VNC, Hummingbird, KEA!, etc will all work. NOTE: VNC is free for client use. Example: If my client machines IP is 192.168.0.110

Linux $ export DISPLAY=192.168.0.110:0.0

6. Now re-execute the runInstaller variable again and you will be presented with the OUI GUI.

Stolen from: http://www.cattsolutions.com/oracle-...play-variable/

Delete the DISPLAY environment setting from your profile.

ssh will forward the protocol, but to do that requires sshd to create the forwarded socket - and that means that sshd must also create the DISPLAY environment variable to use, AND set the security tokens for that display.

Setting the DISPLAY environment variable is ALWAYS the wrong thing to do. A local GUI login WILL create it for you, and it will NOT be 192.168... anything. Local X displays are using DOMAIN sockets for security. Thus setting the DISPLAY to anything will wipe out your access.

The error is that you are setting your DISPLAY environment variable to "172.16.40.30:0.0", and that is INVALID.

sshd on the server must be configured to permit X11 forwarding. Oracle Universal Installer is a java-based application. I'm not sure how well it cooperates with sshd.