License key isn't accepted - 56Illegal or missing hexadecimal sequence in chunked-encoding

Error
  • 56Illegal or missing hexadecimal sequence in chunked-encoding
  • 56Problem (2) in the Chunked-Encoded data
  • License key isn't accepted, because you receive one of the previous messages
Description

This kind of error could happen, when our Cloudflare CDN for some reason thinks, that your website's IP address is harmful. If you have this issue, in Windows you should run command line, either write in your start menu, or in Win8+ into the starting screen: cmd, and run it.

Then ping your website's address in this command line:

ping example.org

It will return your IP address, in my example image it's 93.184.216.34, and you should send us that IP address, and we will put it into our whitelist.