xWindows error: xhost unable to open display Post: 302550635

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Top Forums UNIX for Dummies Questions & Answers xWindows error: xhost unable to open display Post 302550635 by shoefiend on Friday 26th of August 2011 02:24:31 PM

08-26-2011

Registered User

xWindows error: xhost unable to open display

I am trying to direct a AIX display to my XWindows and I am at a dead end now!
So this what I've done so far:

1. In putty settings, I set "Enable X11 forwarding" and also set "X diplay location" to "localhost:0" (without quotes, of course)

2. Via putty, connected to my AIX server
3. On AIX, forwarded display to my Windows box
$ export DISPLAY=<ip address of Windows>:0

Meanwhile, I opened MobaXTerm.exe on my Windows machine
$ ssh username@AIX_host_name

On AIX:
$ xclock
Xlib: connection to "<Windows IP address>:0.0" refused by server
Xlib: No protocol specified
Error: Can't open display: <Windows IP Address>:0

On Windows: tried looking for listener
$ ps -ef | grep listen
root 364732 1 0 Aug 21 - 0:00 /usr/bin/cimlistener

Then tried setting the Windows to be a host to AIX box:
$ xhost <IP Address of AIX box>
1356-200 xhost unable to open display ""

What more to do?

---------- Post updated at 02:24 PM ---------- Previous update was at 12:07 PM ----------

Er.. looks like the various XWindows clients I was trying out were all clashing with one another.

I was trying both XMing and MobaXTerm. Finally noticed that XMing server was still running in the background even though I thought I'd exited XMing.

The following steps in same order worked:
1. Exited XMIng server

2. Connected to AIX server using MobaXTerm
$ ssh username@ServerName

3. In Putty settings, enable X11 Forwarding and set display to localhost:0
(google for this. I am unable to post links as Im a new forum memeber)

4. Connect to AIX using putty
5. Set display to IP address of Windows machine that is running MobaXTerm:
$ echo $DISPLAY

$export DIPSLAY=<ip address of Windows machine>:0

6. Test with a comamnd like xclock. If everything is right, it should display the clock on the windows machine
$ xclock

Last edited by shoefiend; 08-26-2011 at 03:25 PM.. Reason: Resolved the problem myself

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libssh2_channel_x11_req_ex

libssh2_channel_x11_req_ex(3)					  libssh2 manual				     libssh2_channel_x11_req_ex(3)

NAME

       libssh2_channel_x11_req_ex - request an X11 forwarding channel

SYNOPSIS

       #include <libssh2.h>

       int  libssh2_channel_x11_req_ex(LIBSSH2_CHANNEL	*channel,  int	single_connection,  const  char  *auth_proto, const char *auth_cookie, int
       screen_number);

       int libssh2_channel_x11_req(LIBSSH2_CHANNEL *channel, int screen_number);

DESCRIPTION

       channel - Previously opened channel instance such as returned by libssh2_channel_open_ex(3)

       single_connection - non-zero to only forward a single connection.

       auth_proto - X11 authentication protocol to use

       auth_cookie - the cookie (hexadecimal encoded).

       screen_number - the XLL screen to forward

       Request an X11 forwarding on channel. To use X11 forwarding, libssh2_session_callback_set(3) must first	be  called  to	set  LIBSSH2_CALL-
       BACK_X11. This callback will be invoked when the remote host accepts the X11 forwarding.

RETURN VALUE

       Return 0 on success or negative on failure.  It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a
       negative number, it isn't really a failure per se.

ERRORS

       LIBSSH2_ERROR_ALLOC -  An internal memory allocation call failed.

       LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.

       LIBSSH2_ERROR_CHANNEL_REQUEST_DENIED -

SEE ALSO

       libssh2_channel_open_ex(3) libssh2_session_callback_set(3)

libssh2 0.15							    1 Jun 2007					     libssh2_channel_x11_req_ex(3)

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