This might be a bug report since I can't find any reference to this error message anyplace else.

I just added a Sony SRG-X400 camera as an NDI source. When I try to add PTX control, I get the message; "only one usage of socket address is normally permitted." My work around is to make sure PTZ options are cleared, change the Sony camera to RTSP first, then add PTZ options, then change the camera to NDI and it seems to work.