[SR-Users] udp_send "Invalid argument"

in some of my tests i get the following udp send related errors, when request is t_relayed: Oct 24 11:20:20 test /usr/sbin/sip-proxy[10032]: INFO: Routing initial INVITE <sip:+35892223333@test.fi> to <sip:+35892223333@193.166.3.2;transport=udp> Oct 24 11:20:20 test /usr/sbin/sip-proxy[10032]: ERROR: <core> [udp_server.c:566]: ERROR: udp_send: sendto(sock,0xb2d1f1e8,1190,0,193.166.3.2:5060,16): Invalid argument(22) Oct 24 11:20:20 test /usr/sbin/sip-proxy[10032]: : <core> [udp_server.c:571]: CRITICAL: invalid sendtoparameters one possible reason is the server is bound to localhost and attempts to send to the net Oct 24 11:20:20 test /usr/sbin/sip-proxy[10032]: ERROR: tm [../../forward.h:148]: msg_send: ERROR: udp_send failed Oct 24 11:20:20 test /usr/sbin/sip-proxy[10032]: ERROR: tm [t_fwd.c:1244]: ERROR: t_send_branch: sending request on branch 0 failed $du is set to sip:+35892223333@193.166.3.2;transport=udp and the proxy is listening on many sockets, both 127.0.0.1 and external ip address. any idea what might cause the errors? -- juha