"Invalid MIT-MAGIC-COOKIE-1 key" when trying to run program remotely

Question

I've a simple rule like this:

rule "First Rule" //You do not talk about Fight Club
when
    MyInp(id=="1")
then
    insert(new MyOut(true));
end

What I want is, getting the created MyOut object from a Java class. Is there a way to do this or do I have to pass a global variable and update it inside the rule?

Solution 1

The value you're using for DISPLAY is incorrect: if you don't want to use SSH X forwarding, DISPLAY must indicate the IP address of your X server (the desktop you want to display programs on). On the remote, run

export DISPLAY=desktop:0

replacing desktop with your local hostname or IP address. You may also need to change your X server's configuration to allow remote IP connections.

Solution 2

This one worked for me. So I'm leaving this answer here.

 export DISPLAY=:1.0

Solution 3

The Invalid MIT-MAGIC-COOKIE-1 key part must be a separate (non-)error. I get it in the normal working case of starting any graphical program (even gitk).

Somebody just forgot to end it with a newline, so pretend it's a separate line.

Solution 4

old question, but still happening, here on a completely new installed Opensuse Leap 15.3

in my case I had an empty /etc/hostname file and did fill it with

hostnamectl set-hostname mySysName

to eliminate the "Invalid MIT-MAGIC-COOKIE-1 key" message (doing this with YaST seems more complicated - not tried)

Solution 5

For me the error was :

Invalid MIT-MAGIC-COOKIE-1 keyxcb_connection_has_error() returned true
Invalid MIT-MAGIC-COOKIE-1 keyERROR: Unable to create GUI. Exiting

I played with .Xauthority but it did nothing but hide the "MIT cookie" part, not the xcb_connection error. In the end it worked just by using @PSN answer (export DISPLAY=:1.0).

fwiw i'm on debian 9.

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Comments

[Admin]

Is there an X server running on the server's console? I don't understand where you want the program's output to be displayed. Your procedure is clearly wrong since you're getting the local host's cookie but you don't display on the local host. If there is an X server running on the remote machine and that's where you want the program to be displayed, see unix.stackexchange.com/questions/10121/…

[GokcenG]

Thanks @Steve. If I understood you correctly, I can't get new objects from Stateless session, am I right?

[Steve]

No ... you just run the execute() method, which encapsulates creating a stateful (!) session, inserting facts and then terminating that session. So after running, you have no means of querying the session for facts. However, I'll add a quick note on WorkingMemoryEventListener, as that could be used to achieve that goal.

[GokcenG]

Ok Steve. I don't like EventListener approach too. So I'll go with inserting an empty message/output object to session beforehand and retrieve it after.

[Steve]

I think that's the best approach - insert a MyRequest/MyResult pair.

[kiko]

This ignores the XAUTHORITY problem, which is what causes the actual error message in the subject line.

[Admin]

$ xhost +local: xhost: unable to open display "desktop:0"

[Arun Kumar Nagarajan]

Worked for me! Been stuck with this error for a long time. Could you please explain what it means though?

[PSN]

:1.0 is actually an abreviation and means "display 1 at localhost". The format of the display variable is [host]:<display>[.screen]. host refers to a network host name, and if absent means to connect to the local machine via a unix domain socket. Each host can have multiple displays, and each display can have multiple screens. Screens aren't used much anymore, with xinerama and now xrandr combining multiple screens into a single logical screen. Source: unix.stackexchange.com/a/16816

[Admin]

@Moberg: It disables authentication control. It allows any user to open graphical windows on your display. So it's not something you want to do all the time! But when you know you want to run some graphical app as a different user, it's what you need to do.

[Admin]

$ DISPLAY=:0 xhost +local: gives Invalid MIT-MAGIC-COOKIE-1 key