ripper.. what i did was opened jriver tools settings network (providing you have newest version) if not get it.
once open look for the port jriver is using. on mine its 52198
then login to your router\modem. and goto port options and open that port number (52198) then go back to jriver settings manage access to server click on test connection. also ya need share your library, playlists, dlna server, dlna renderer, dlna controller checked\ticked.
in your cellphone browser(safari, opera, Ie, etc..) type in your ip addess with jim's instructions(, mine for example when i open my browser on my htc hd2 . is 192.167,8,136:52198/webplay this is saved as a bookmark for me so when i click on it it automatically opens jriver webplay for... if i'm AT HOME, if away from home you would use a diffrent ip.
If i want to use my phone to control jriver AT HOME ON PC not play it on phone i would use webremote... 192.167.8.136:52198/webremote
If i want to use my phone to listen to jriver ON MY PC not play it on PC i would use webplay... 192.167.8.136:52198/webplay
192.167.8.136 = ip address on router for jriver library of the computer i want to listen to or control while in my HOME network.
52198 = port number that i opened in my router\modem, and the port number in jriver network settings... look here to open your ports.
http://portforward.com//webremote = what ya wanna connect to .. webremote to control your jriver while around the house.. meaning listening to music vids etc ya can use your cell phones to change the songs volume etc on the PC..not STREAMINNG.
/webplay = streaming your files from the pc you chose from the ip you wrote in to your device browser.. so listening to music\vids pics etc on your device streamed from your jriver pc.
maybe this helps?