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Citrix ICA Session Reliability
TCP port 2598 is used by Citrix Independent Computing Architecture (ICA) protocol when Session Reliability is enabled, providing a seamless user experience during momentary network disruptions. Unlike the standard ICA port 1494, port 2598 supports the Common Gateway Protocol (CGP), allowing Citrix sessions to maintain connectivity without user interruption by buffering data until the network stabilizes..
TCP port 2598 is primarily associated with Citrix ICA protocol in implementations where Session Reliability is enabled. In such scenarios, Citrix uses the Common Gateway Protocol (CGP) to encapsulate the ICA protocol, enabling connection stability. This port acts as an intermediary that handles disconnections by keeping the session active even if the underlying network is temporarily unavailable.
When a user connects to a Citrix XenApp or XenDesktop environment, the initial handshake may occur over TCP port 2598 if Session Reliability is turned on. CGP intercepts and maintains the ICA session, buffering and managing packets during brief interruptions. This ensures user applications remain responsive, and the session state is preserved throughout the connectivity hiccup.
Compared to the standard port 1494, which provides a direct connection for ICA, port 2598 offers enhanced resiliency. It is important for system administrators to configure firewalls and network appliances to allow traffic on this port to fully utilize Session Reliability features and optimize end-user experience.