When users connect to a remote desktop with the Microsoft RDP display protocol, Horizon Client can make a second HTTPS connection to the View Connection Server host. This connection is called the tunnel connection because it provides a tunnel for carrying RDP data.
The tunnel connection offers the following advantages:
RDP data is tunneled through HTTPS and is encrypted using SSL. This powerful security protocol is consistent with the security provided by other secure Web sites, such as those that are used for online banking and credit card payments.
A client can access multiple desktops over a single HTTPS connection, which reduces the overall protocol overhead.
Because View manages the HTTPS connection, the reliability of the underlying protocols is significantly improved. If a user temporarily loses a network connection, the HTTP connection is reestablished after the network connection is restored and the RDP connection automatically resumes without requiring the user to reconnect and log in again.
In a standard deployment of View Connection Server instances, the HTTPS secure connection terminates at the View Connection Server. In a DMZ deployment, the HTTPS secure connection terminates at a security server. See Preparing to Use a Security Server for information on DMZ deployments and security servers.
Clients that use the PCoIP display protocol can use the tunnel connection for USB redirection and multimedia redirection (MMR) acceleration, but for all other data, PCoIP uses the PCoIP Secure Gateway on a security server. For more information, see Client Connections Using the PCoIP Secure Gateway.