<strike>Hi @mads2590, "10.15.6" is not a valid IP address, unless you miss-typed? Your local IP address should consist of four numbers (i.e. "10.1.5.6").</strike> (Whoops, I've been informed this is probably the mac version not the IP). You also need to make sure you go to the same port. Look at the links in the OpenLP settings and you should see the correct address in there.
<br>
If you've checked all of that and it still doesn't work, does it work on the computer that is running OpenLP?<br>
<br>