And make sure that it has an X connection to forward in the first place (Xmanager must be running, and Xshell must be aware of it - once again, because I don't know Xshell, I don't know if that's supposed to work automatically or if you need to e.g. Make sure that it's configured to forward the X connection. If DISPLAY isn't set at all, check your Xshell settings. If DISPLAY is set to a bad value, check your initialization file: make sure that they don't set DISPLAY. OpenSSH uses the first free display number starting at 10 (you'll get a higher number if there are other remote X connections already). The first thing to check is echo $DISPLAY: does it look reasonable? It would typically be something like localhost:10.0, with the host part localhost because the SSH server is relaying connections the SSH server machine where the X clients will be running to the SSH client machine which is running the X server. Click Play for a short introduction to VShell. Then, if xclock doesn't work, you can begin to investigate why. Under a normal SSH connection, either SSH sets DISPLAY automatically, and everything works, or SSH doesn't set DISPLAY, and then setting it manually cannot work because that means SSH isn't relaying the X11 connection.
Unless Xshell (which I'm not familiar with) is doing something unusual, you must not set DISPLAY.
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