On Thu, Nov 20, 2008 at 10:05 PM, swm38 swm38 <swmm38@googlemail.com> wrote: > I can't get X11 Forwarding working with lenny as server. > Error: Can't open display: localhost:10.0 I had the same problem on 3 machines I upgraded from etch to lenny. But I don't know how to solve it/what's causing it.