For almost a complete month,
zhongguojie.org has not worked and I was starting to get really really worried. A few days ago it revived, but all is not well there. I don't have good enough language skills to determine what happened,
but there is now a replacement,
jieyiwang.cn (Knot Art Network) it doesn't look like much at the moment, but
https://bbs.jieyiwang.cn/ seems to have everything (the new, non-bbs, landing page makes it seem like all was lost, but it doesn't seem so). I was able to use my login from zgj.org, picked a random thing that I had saved previously and substitute jieyiwang.cn into the URL and the page showed up. How long zgj.org will remain up, I have no idea.
Good news though, that such a massive and useful repository of knowledge is not gone.
