I have recently been playing Mario kart wii online with Dolphin via the wiimmfi server by using my real wii nand and a patched iso however for the past few days I have not been able to find any players online.
By checking the stats page the wiimmfi server appears to be working and people are online. I have taken a screenshot to show that their are actual people racing:

I find it really strange that I'm able to connect to the wiimmfi server and go on worldwide but from past there the game just stays on the "Searching for players" screen. I was able to play on the wiimmfi server just fine in September. I have recorded what I'm experiencing when I try play online. Link: https://www.youtube.com/watch?v=i8qOb6iRPf0 I'm using Dolphin version 4.0-3106 if that helps.

What I have tried doing:

Used a nand from a different wii
Changed my vr to 5000, 9999, 9000 to match with players of equal or similar skill
Used a Gecko code which removes the "Match player with similar skill level/VR"
Leaving the game on the "Searching for players" screen for nearly an hour (Had to use a bottle to keep hold of the left click on my mouse which emulates the wiimote shaking to avoid "Connection interrupted with wiimote" message)

I posted this issue on here because I believe that it may be a Wimmfi bug.

First non working connection: October 10th 2014 19:09 GMT+0100 (GMT Summer Time)
Last working connection: September 27th 2014 17:55 GMT+0100 (GMT Summer Time)

This should be the right dates but I'm not entirely sure if this is accurate.

EDIT: As of October 17th 18:21 GMT+0100 I am able to find players and race without any issues.