The only karaoke-realm I know of is on the EFnet network. It would appear that 2 hubs and a server has de-linked over the past few weeks from this network, so you may have an incorrect server in your setup or the round robin is screwed up. I would suggest you try connecting manually to one of the remaining hubs or servers. CLICK HERE for a list by area of available servers for EFnet
Good luck

Happy mIRC user on Linux