[16:44] <abd_bela>  I ve installed the stable squeeze 6.0.7 64-bit on a server, connection through the xdmcp works well without problem thin client. Unfortunately some old software (eg gnuplot, lyx, ...), so I did the update with wheezy depot and there problem.  The login window appears on thin client then disappears right away after with error on thin client I think there is incompatibility with xfree86 and keyboard / mouse?!