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SQL Developer on Oracle Linux - Unsupported authorisation protocol

Mark.ThompsonApr 27 2018 — edited Apr 27 2018

After installing SQL Developer on an Oracle Linux machine (Oracle Cloud), and having it working great on Wednesday through MobaXterm, it now is throwing this error.

MobaXterm X11 proxy: Unsupported authorisation protocol

Exception in thread "main" java.awt.AWTError: Can't connect to X11 window server using 'localhost:10.0' as the value of the DISPLAY variable.

        at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)

        at sun.awt.X11GraphicsEnvironment.access$200(X11GraphicsEnvironment.java:65)

        at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:115)

        at java.security.AccessController.doPrivileged(Native Method)

        at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:74)

        at java.lang.Class.forName0(Native Method)

        at java.lang.Class.forName(Class.java:264)

        at java.awt.GraphicsEnvironment.createGE(GraphicsEnvironment.java:103)

        at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:82)

        at sun.awt.X11.XToolkit.<clinit>(XToolkit.java:126)

        at java.lang.Class.forName0(Native Method)

        at java.lang.Class.forName(Class.java:264)

        at java.awt.Toolkit$2.run(Toolkit.java:860)

        at java.awt.Toolkit$2.run(Toolkit.java:855)

        at java.security.AccessController.doPrivileged(Native Method)

        at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:854)

        at java.awt.Toolkit.getEventQueue(Toolkit.java:1734)

        at java.awt.EventQueue.isDispatchThread(EventQueue.java:1043)

        at javax.swing.SwingUtilities.isEventDispatchThread(SwingUtilities.java:1361)

        at oracle.ide.osgi.boot.SplashScreenImpl.SynchronizeWithEdt(SplashScreenImpl.java:529)

        at oracle.ide.osgi.boot.api.SplashScreen.createInstance(SplashScreen.java:66)

        at oracle.ide.osgi.boot.OracleIdeLauncher.showSplashScreen(OracleIdeLauncher.java:828)

        at oracle.ide.osgi.boot.OracleIdeLauncher.main(OracleIdeLauncher.java:109)

I found a couple of non-useful suggestions with a Google search.

I even tried creating an entirely new machine and starting over with a new installation of sqldeveloper.  Still no good.  Same thing.

Any thoughts?

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Locked on May 25 2018
Added on Apr 27 2018
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