By the logs, remote server returned that you're not authorized. It is probably because user agent is not present in request. With filter was also installed plugin into TV Service Configuration, where you can make some changes. So, in TV Server Configuration turn on MediaPortal IPTV filter and source splitter plugin and load your scan playlist into plugin. Select all HTTP urls and in options editor scroll down until you find UserAgent. Insert into UserAgent vlc/1.1.8. Then save playlist to new file and try to scan again.