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UNIX for Dummies Questions & Answers
Can't open VirtualBox from Tera Term X11 error
Post 302616211 by Corona688 on Friday 30th of March 2012 03:50:50 PM
03-30-2012
Why would you want VirtualBox to connect its graphical interface to the telnet server of the wrong machine? 
Let me explain how SSH port forwarding works.
You tell SSH to forward a port on the remote host to a port on your local host.
When you connect to the remote server with SSH, the SSH server opens an extra port on the local host itself, waiting for you to connect to it.
When you connect to it, the SSH server forwards this back to the client, your client connects to whatever you told it to earlier.
So in effect, it creates a new port on the remote host, which connects it directly to X11 on your machine.
If you don't know what port number your X11 server is, you'll have to find out and forward it, since ordinary X11 forwarding doesn't seem to be working.
Let me explain how SSH port forwarding works.
You tell SSH to forward a port on the remote host to a port on your local host.
When you connect to the remote server with SSH, the SSH server opens an extra port on the local host itself, waiting for you to connect to it.
When you connect to it, the SSH server forwards this back to the client, your client connects to whatever you told it to earlier.
So in effect, it creates a new port on the remote host, which connects it directly to X11 on your machine.
If you don't know what port number your X11 server is, you'll have to find out and forward it, since ordinary X11 forwarding doesn't seem to be working.
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LEARN ABOUT DEBIAN
libssh2_channel_direct_tcpip_ex
libssh2_channel_direct_tcpip_ex(3) libssh2 manual libssh2_channel_direct_tcpip_ex(3) NAME
libssh2_channel_direct_tcpip_ex - Tunnel a TCP connection through an SSH session SYNOPSIS
#include <libssh2.h> LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip_ex(LIBSSH2_SESSION *session, const char *host, int port, const char *shost, int sport); LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip(LIBSSH2_SESSION *session, const char *host, int port); DESCRIPTION
session - Session instance as returned by libssh2_session_init_ex(3) host - Third party host to connect to using the SSH host as a proxy. port - Port on third party host to connect to. shost - Host to tell the SSH server the connection originated on. sport - Port to tell the SSH server the connection originated from. Tunnel a TCP/IP connection through the SSH transport via the remote host to a third party. Communication from the client to the SSH server remains encrypted, communication from the server to the 3rd party host travels in cleartext. RETURN VALUE
Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors. ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed. SEE ALSO
libssh2_session_init_ex(3) libssh2 0.15 1 Jun 2007 libssh2_channel_direct_tcpip_ex(3)