License Manager Daemon TCP 27000 handles initial point of contact for license requests
License Management Console TCP 8082 Web-based administration console
Citrix Receiver TCP 80/443 Communication with Merchandising Server
ICA TCP 1494 Access to applications and virtual desktops
ICA with Session reliability TCP/2598
IMA TCP 2512 Independent Management Architecture (IMA)
Management Console TCP 2513 Citrix Management/XenApp Advance Consoles
Application / Desktop Request TCP 80/8080/443 XML Service
Database TCP 1433 Microsoft SQL Server
DNS TCP/UDP 53
TFTP UDP 69 Trivial File Transfer