Added exception handler for ProtocolError.

Signed-off-by: Ewan Mellor <ewan@xensource.com>

tools/python/xen/xm/main.py

@@ -1102,6 +1102,12 @@ def main(argv=sys.argv):
             else:
                 err("Error connecting to xend: %s." % ex[1])
             sys.exit(1)
+        except xmlrpclib.ProtocolError, ex:
+            if os.geteuid() != 0:
+                err("Most commands need root access.  Please try again as root.")
+            else:
+                err("Error connecting to xend: %s." % ex.errmsg)
+            sys.exit(1)
         except SystemExit:
             sys.exit(1)
         except xmlrpclib.Fault, ex: