I too have been experiencing a loss of ability to use any dns hosts for blocking sony websites...Everything worked fine until a few weeks ago when I could no longer connect to Al azif or Karo dns ... I have been using the same dns now for such a long time I have them memorized so I know I was...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced