Troubleshooting Citrix XenApp®

Communication channels

While XenDesktop/XenApp uses a large number of ports to communicate between components, the most common ones are:

• Ports 80/443 used by Receiver to connect to StoreFront
• Port 1494 when the ICA/HDX protocol starts
• Port 2598 for Session reliability (if enabled)
• Ports 80/8080/443 for the XML service and 2513 for the Citrix Management console

The following table illustrates the complete list of ports used by XenApp/XenDesktop 7.5 and later:

Source	Description	Type	Port (s)	Details
User (External) NS Gateway	Internal Network through	TCP	443
User (Internal)	StoreFront	TCP	80/443	Connecting to the Store or Receiver for the website hosted on the StoreFront server.
Delivery Controller	Active Directory	TCP	389/636