I believe I read a report that the Stalker IPTV server or software isn't working so I can't really confirm or deny but it doesn't appear to be connecting or allowing any connections. Best to try downloading Kodi 16 rc3 onto a windows based PC or whatever else you might have as I found everything runs smooth, easy with no server issues aside from some of the selections having no available servers.
UPDATE: I haven't changed anything, Stalker server is up, connecting and appears to be working ???