The newer ZIM Socket is down - looking into it - we did not change anything and the server reports that it is running but it is giving us CORS errors. The newer one got around CORS errors and did not need a whitelist. We are trying to figure out why it all of a sudden broken. Give us a time machine back to before CORS!
Sorry - this was fixed the day it was reported - Cloudflare, our CDN, had changed its CORS to FULL - Strict instead of FULL. We changed it back and it worked.