This is driving me crazy as well. I can't seem to get it to work, and it's been almost a week since I was able to get any results. This happened a couple months ago for awhile, then slowly came back online, but since the newest update it won't show me anything.

I hope somebody has some insight as to why this is an issue, because nothing is working on my end, and I miss the functionality of this tool...

Unforunately, as I know no clues are available. I ask seoquake support for the reasons and solutions, but they all the time saying that google changed its algorithms, and they are trying to solve.

And what's more, after closing yahoo site explorer, they replaced it with semrush link/linkdomain which also doesn't work.