The site websniffer.cc is under a DDoS attack already for several weeks. It caused a few downtimes and other problems at the shared hosting that we used back then. The DDoS was also overloading the server of the shared hosting provider. One day ago they asked us politely to stop point the domain name records to their server's IP address. After a couple of hours access to all files in our hosting account was suspended, what effectively caused the site downtime. Today the site was moved to a virtual server on AWS. My guess is that the DDoS is still ongoing, but right now I don't have enough time to look closer into that. Now on AWS there is a full control over log files and the environment, what might help to sort the things out in the near future.