Session Reliability

A MetaFrame Presentation Server Client, configured to use “Session Reliability,” establishes an ICA session on TCP port 2598 (instead of port 1494) when connecting to Presentation Server.

Port number (default 2598): Assign the port on which you want the servers in the farm to listen for attempts to reestablish dropped connections.

When session reliability is enabled, the ICA Client tunnels its ICA traffic inside the Common Gateway Protocol and sends the traffic to port 2598. The XTE service acts as a relay, unwrapping the Common Gateway Protocol layer and then forwarding traffic to the ICA listener on port 1494.

Likewise, the Presentation Server sends ICA data to the client by way of the XTE service. If the Common Gateway Protocol connection between the client and the XTE service is broken, the ICA listener can continue to send ICA traffic to the XTE service, where it will be buffered until the client reconnects. The user’s session does not go into a disconnected state as long as the XTE service is buffering data for the user.

On the client, the user’s application will appear frozen while the client attempts to rebuild the Common Gateway Protocol connection. Once the connection is restored, the XTE service flushes the buffered ICA data to the client and the session continues.