Kodi 16 - Stalker Client, authentication failed

You need to put an actual portal number in the server field. The one specified does not carry an actual portal address. Depending on your portal assignment that you obtain from the Donation Checker, you configure the address accordingly...

Code:
http://portal1.iptvprivateserver.tv/stalker_portal/c/index.html or
http://portal2.iptvprivateserver.tv/stalker_portal/c/index.html or 
http://portal3.iptvprivateserver.tv/stalker_portal/c/index.html, etc.

thanks it worked but the guide does not
 
If you're specifying the download path in the updater, you can specify this:

Code:
special://userdata/addon_data/pvr.stalker

If you're specifying the source file for the guide in PVR Stalker, you would specify this:

Code:
special://userdata/addon_data/pvr.stalker/epg_xmltv.xml