There are often misconceptions among customers about what the data flow or process is when making a Citrix HDX connection. Basically, it is quite simple, but sometimes misconceptions persist. My experience tells me that pictures often explain more than language. This is a two-part article and the first part is about the internal connection setup for a single FQDN configuration and then the second part is about how the whole thing works externally. Not every tiny detail will be explained now, but it should clarify the basic process better.