# WHATPORT(1494)

## NAME

port 1494 — Citrix ICA — Citrix ICA/HDX — the remote display protocol carrying a published desktop or app to the client.

Protocol: TCP  
IANA registry

## DESCRIPTION

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.

## EXPOSURE

**Do not expose.** Do not publish raw 1494 to the internet — Citrix's own answer is ICA over TLS via a gateway on 443, which also gives you authentication in front of the session.

## CHECK

```sh
nmap -Pn -p 1494,2598 TARGET
```

## SEE ALSO

- docs — [Citrix — Linux Virtual Delivery Agent network port matrix (ICA/HDX on TCP 1494, 2598 with Session Reliability)](https://docs.citrix.com/en-us/linux-virtual-delivery-agent/current-release/configure/administration/network-port-matrix.html) (docs.citrix.com)
- iana — [IANA Service Name and Transport Protocol Port Number Registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) (iana.org)

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HTML: <https://whatport.net/1494/> · JSON: <https://whatport.net/1494.json> · full dataset: <https://whatport.net/ports.json>