 The server runs on Solaris and Linux platforms; it listens by default on TCP ports 5307 or 3144 but can be configured to operate solely over a single port, usually 443, the so-called "Firewall Forwarding mode".The Secure Global Desktop Server additionally connects to back-end servers where the applications run using native display protocols such as RDP, ssh, X11, TN5250 or TN3270.These "application server" platforms can be Windows 2000 Server, Windows 2000 Advanced Server, Windows 2000 Datacenter Server and Windows Server 2003, or Windows client platforms that support RDP such as Windows XP and Windows Vista, as well as other operating systems such as Linux, Solaris, AIX, HP-UX and IBM application servers.