Well, actually this true for ww/vc games only.There currently is no way to play online via emu nand.
The online works a treat with disc based games via nand emu.
And this makes me believe that it's a loader issue. Prolly the loader is missing some init stuff when launching ww/vc games, but I might be wrong.
Also it's just the online play that is broken because you can successfully connect to online stores.
Didn't we already discuss about this? If i remember correct it was:
TriiForce + cIOS + no cheats/wiird + real nand = VC/WiiWare wifi working
TriiForce + cIOS + no cheats/wiird + emu nand = VC/WiiWare wifi not working