ProtocolVersion exception using Rebex HTTPS

Hello,

The lib is throwing the exception below, does anyone know why it happens? It's happening on RC3 running on .NET 4.6

Error while processing request. Fatal error 'ProtocolVersion' has been encountered on the local connection end.
   em Rebex.Net.HttpRequest.vjby()
   em Rebex.Net.HttpRequest.vjbx()
   em Rebex.Net.HttpRequest.vjbw()
   em Rebex.Net.HttpRequest.GetResponse()

Thanks