[linux-audio-user] Could not connect to JACK server as client

Hi people ! I gonna be clearest as possible ! My system : debian sarge, gnome, 2.6.14-2 homemade kernel. Before : (Just an abstract) Ardour (0.9beta28 debian version) Jack (0.99 debian version) Qjackctl (0.2.15a debian version) I was building new version of ardour (0.99.2) from sources, it was build in /usr/local a separate partition. I tryed and it works. So i built jack (0.100) from source too. It was okay so Know : Ardour (0.9beta28 debian version) Jack (0.99 debian version) Qjackctl (0.2.15a debian version) plus Ardour (0.99.2) Jack (0.100) installed in /usr/local. But, and this the trouble when i start Qjackctl (with /usr/local/bin/jackd in the setup path) i've got this message : 18:45:28.566 Patchbay deactivated. 18:45:28.653 Statistics reset. 18:45:28.759 Startup script... 18:45:28.760 artsshell -q terminateessai JACK compiled with System V SHM support 18:45:28.778 MIDI connection graph change. 18:45:29.364 Startup script terminated with exit status=256. 18:45:29.364 JACK is starting... 18:45:29.364 /usr/local/bin/jackd -R -dalsa -dhw:0 -r44100 -p1024 -n2 18:45:29.373 JACK was started with PID=6237 (0x185d). jackd 0.100.0 Copyright 2001-2005 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details JACK compiled with System V SHM support. loading driver .. apparent rate = 44100 creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|nomon|swmeter|-| 32bit control device hw:0 configuring for 44100Hz, period = 1024 frames, buffer = 2 periods Note: audio device hw:0 doesn't support a 32bit sample format so JACK will try a 24bit format instead Note: audio device hw:0 doesn't support a 24bit sample format so JACK will try a 16bit format instead nperiods = 2 for capture Note: audio device hw:0 doesn't support a 32bit sample format so JACK will try a 24bit format instead Note: audio device hw:0 doesn't support a 24bit sample format so JACK will try a 16bit format instead nperiods = 2 for playback 18:45:29.575 MIDI connection change. 18:45:31.586 Could not connect to JACK server as client. 18:45:33.573 JACK is stopping... jack main caught signal 15 no message buffer overruns 18:45:33.740 JACK was stopped successfully. (As you see there's the time in Paris :)) Same if i start Qjackctl under root. If i try to launch Qjackctl with the default path setup (/usr/bin/jackd) i've got a segmentation fault. Is there someone who have a idea, what can i do ? Merci d'avance, best regards P'tit Louis.