Session reliability works at the client end. It allows a client to reconnect and avoid inconvenience to a user during a short network interruption. Instead of removing all unresponsive apps and desktops from the client workbench, they will be kept open until the ICA client is able to reconnect to the terminal server. It uses port 2598 and is available with Advanced and Enterprise versions.

Whereas ICA Keep-Alive works at the server end allowing a server to detect broken sessions and put them into a ‘disconnected’ state if it can’t ping the client device. This makes sure that users can reconnect to disconnected sessions before the sessions timeout. It uses port 1494.