> > xhost + 192.168.2.100
> >
> > returns - unable to open display""
>
> That is strange, xhost(1) should never return that. Are you sure you
> didn't get a message like that returned from an actual X client?

Or ...

You must be running xhost on the remote system.

You should run the xhost on the X server itself. (Usually, the X server is
where you physically sit at a keyboard, pointer device, and video
display.)

   Jeremy C. Reed
   http://www.reedmedia.net/