[LAU] connecting jack between a linux audio master and a windows slave

Hi all, i'm attempting to connect a slave jack running on windows 7 64bit and a jack master running on linux ubuntu studio 14.04 64bit. jack is verified to be 1.9.10 on both sides. firewall is also completely open between windows and linux. the 2 ends can ping each other - no problem jack master is running on alsa and with netjack2 also running. other linux pc's connect without a problem to this jack master. but jack slave running from windows does not show up on master jack... what can I assume is wrong? mtu have not been tampered with. jack slave on windows states: C:\Program Files (x86)\Jack>jackd.exe -dnet -i2 -o9 -C8 -p8 jackdmp 1.9.10 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2014 Grame. jackdmp 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 Drivers/internals found in : C:\Windows Drivers/internals found in : C:\Windows JACK server starting in realtime mode with priority 10 self-connect-mode is "Don't restrict self connect requests" InitTime : multimedia timer resolution set to 1 milliseconds MMCSS API not used... NetDriver started in async mode without Master's transport sync. Waiting for a master... and here is the same running it with verbose output : http://pastebin.com/KZTRLigc I am using 'tcpdump' on the *jack master* to listen for udp packets on port 19000 (where jack broadcasts by default). the cmd is: tcpdump host <ip_of_jackd_client> and udp port 19000 In turn I checked some linux clients and the windows client: linux cl1 (ip 192.168.112.133 - name jackcl1) 16:10:39.532802 IP jackcl1.19000 > jack_master.58548: UDP, length 44 16:10:39.533960 IP jack_master.58548 > jackcl1.19000: UDP, length 1500 16:10:39.533970 IP jack_master.58548 > jackcl1.19000: UDP, length 204 linux client 2 (ip 192.168.112.144 - name jackcl2) looks similar 16:23:09.842778 IP jackcl2.19000 > jack_master.54735: UDP, length 204 16:23:09.842782 IP jackcl2.19000 > jack_master.54735: UDP, length 564 16:23:09.843880 IP jack_master.54735 > jackcl2.19000: UDP, length 1500 16:23:09.843890 IP jack_master.54735 > jackcl2.19000: UDP, length 204 unfortunately it looks like the windows jack client sends out the packets, but the jack master never responds... 16:11:52.040582 IP wincl1.19000 > jack_master.19000: UDP, length 644 16:11:53.528440 IP wincl1.19000 > jack_master.19000: UDP, length 644 16:11:55.028455 IP wincl1.19000 > jack_master.19000: UDP, length 644 can you make anything out of that? thank you in advance for your help.