grdvr:
Ok, we found what was wrong, port number must be the video stream port (5100), not the mobile video stream port (5101)

Sorry Sir, my mistake, I forgot to notice that this new version iPhone/iPad Client is connecting with port 5100.
Also, new version software connect to DVR Server software and get substream by default(can not change). Because of the decode ability of iPhone hardware itself, higher resolution/image quality/frame rate video would not be decode/displayed well. So please set the resolution/image quality/frame rate of the substream video lower if you want to connect with iPhone.
With new version "Net PCDvrViewer", we do suggest customers to work it on iPad but not on a iPhone(with iPhone, better to use PCDVRVIEWER).