Citrix ICA/HDX — the remote display protocol carrying a published desktop or app to the client.
ICA (Independent Computing Architecture), marketed as HDX, is the protocol between a Citrix client and a Virtual Delivery Agent, carrying screen updates, input, audio, printing and drive mapping in virtual channels. TCP 1494 is the default; when Session Reliability is enabled, the client instead connects to TCP 2598, where the Common Gateway Protocol wraps the same ICA stream so a brief network drop does not kill the session. Citrix treats both as fixed ports. An open 1494 identifies a Citrix VDA or session host.
Do not expose
Do not publish raw 1494 to the internet — Citrix's own answer is ICA over TLS via a gateway on 443, which also gives you authentication in front of the session.
$ nmap -Pn -p 1494,2598 TARGETSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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