Hello, I just upgraded one machine (HP-UX 11.0) from 2.5.1p2 to 2.9p2 and found that a hendl at host_a# ssh host_b works fine with authentication agent and X11 forwarding on but a hendl at host_b# su root at host_b# /usr/bin/X11/xclock afterwards gives errors like debug: X11 connection uses different authentication protocol. debug: X11 rejected 0 i1/o16 ... debug: X11 connection to ... broken... With version 2.5.1p2 these errors don't occur. What shell I do? Thanks regards Stephan -- LDS Brandenburg Dr. Stephan Hendl fon: +49-(0)331-39 471 fax: +49-(0)331-27548 1187 EMail: stephan.hendl at lds.brandenburg.de