@eXch.cc is it possible that some IP addresses are banned by eXch exchange or it could be something browser related?
Some people told me that they can't access eXch website with clearnet domain, and they receive message like this in Chrome browser:
This page isn’t working
exch.cx didn’t send any data.
ERR_EMPTY_RESPONSE
It could be a number of factors including a browser related problem. Have them try a different browser using the same IP address to see if it works?
Maybe an extension causing this? They could disable the extensions or also run the browser in incognito mode to rule out the browser extension, as probably cause.
Another cause could be the ISP in their jurisdiction trying to block access to eXch.cx rather than the other way round.