Unable to stream audio with Jack

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I've been struggling for the past week to do the most basic task with Jack NetDriver. I have 3 machines connected over a LAN. The speakers are on an Ubuntu 14.4 box and a Windows box, while the audio source is connected to the line-in of a Windows box. So far it seems like Jack is connecting, but I can't get either box to output any audio.

JACK slave (on speaker-PC) Ubuntu:

$ jackd -R -d alsa -P -r 48000 -S
$ jack_load netadapter -i '-C 2'
$ jack_connect netadapter:capture_1 system:playback_1
$ jack_connect netadapter:capture_2 system:playback_2

JACK slave (on speaker-PC) Windows 7:

C: jackd.exe -R -S -d net
C: jack_load netadapter
C: jack_connect netadapter:capture_1 system:playback_1
C: jack_connect netadapter:capture_2 system:playback_2


JACK slave (on speaker-PC) Windows 7:

C: jackd.exe -R -S -d portaudio "ASIO::ASIO4ALL v2"
C: jack_load netadapter
In JackControl connect linein1->slave1
In JackControl connect linein2->slave2
In JackControl press the play button

Results neither of my slaves play any audio. And I get error messages like this:


**************** Network parameters ****************
Name : luke2-win7
Protocol revision : 8
MTU : 1500
Master name : opteron-PC
Slave name : luke2-win7
ID : 1
Transport Sync : no
Send channels (audio - midi) : 8 - 0
Return channels (audio - midi) : 2 - 0
Sample rate : 48000 frames per second
Period size : 1024 frames per period
Network latency : 5 cycles
SampleEncoder : Float
Slave mode : sync
****************************************************
Recv connection lost error
Driver is restarted
MMCSS API not used...
JackTimedDriver::Process XRun = 145 usec
Restarting driver...
NetDriver started in sync mode without Master's transport sync.
Waiting for a master...
Initializing connection with opteron-PC...
**************** Network parameters ****************
Name : luke2-win7
Protocol revision : 8
MTU : 1500
Master name : opteron-PC
Slave name : luke2-win7
ID : 1
Transport Sync : no
Send channels (audio - midi) : 8 - 0
Return channels (audio - midi) : 2 - 0
Sample rate : 48000 frames per second
Period size : 1024 frames per period
Network latency : 5 cycles
SampleEncoder : Float
Slave mode : sync
****************************************************
Wrong packet type : a
NetSlave : missing last data packet
...
Wrong packet type : a
NetSlave : missing last data packet
Wrong packet type : a

Can any Pro's help a total beginner out?
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