Yesterday night, we detected issues with the DNS resolvers. After analysis, we have determined that the domain name "qcby.ml" cannot be resolved by any DNS service. While it was inconsistent at first, that was because in some cases the domain was in the cache of the DNS resolvers.
After about 12hrs, most if not all of the caches expired, making the domain effectively disappear.
We have unfortunately no power on this.
Our DNS servers are working as intended, and if queried directly they do report the correct IP addresses. The servers up in the chain are not working correctly.
At this point we don't believe that any compromisation of user accounts or user data has happened.