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Just downloaded Kodi Remote app from Apple App Store for my iPhone. Configuration was easy, it detected my device on the network, except for some reason OSMC sets up the default username as raspberry and password as pi for the http web server instead of osmc and osmc as I was expecting. Once I sorted that out, it was fine. I had to change OSMC skin to Confluence skin to make sure the http server was switched on, and that's when I spotted the difference in usernames/passwords. Hope it helps someone else who gets connection refused when they are setting it up.