---
title: "Network Requirements — TCP/UDP Ports"
slug: "network-requirements-tcpudp-ports-3"
tags: ["TCP", "UDP", "assurance sensor 24.07", "Assurance Sensor GT", "Assurance Sensor GT-S", "Assurance Sensor LT-S", "Assurance Sensor LX-S", "Assurance Sensors"]
updated: 2026-06-01T15:49:15Z
published: 2026-06-01T15:49:15Z
canonical: "docs.crossworkassurance.cisco.com/network-requirements-tcpudp-ports-3"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crossworkassurance.cisco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Network Requirements — TCP/UDP Ports

Cisco® Crosswork Assurance Sensors use various Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) ports for different services and applications.

The following table lists the TCP and UDP ports used by these devices. This information is useful for configuring firewalls on a network.

**TCP/UDP Port Usage by Crosswork Assurance Sensors**

**Note:** The indicated destination ports are the default values. You can use different values as needed.

| Protocol | Dest. Port | Service Name | Applications | Direction |
| --- | --- | --- | --- | --- |
| TCP | 443 | HTTPS | Web Interface | User station to Device |
| TCP | 22 | SSH | Command Line Interface (CLI) | User station to Device |
| TCP | 23 | Telnet | Command Line Interface (CLI) | User station to Device |
| UDP | 161 | SNMP | SNMP Polling | Server to Device |
| TCP | 49 | TACACS+ | User authentication and authorization | Server to Device |
| TCP | 14040 | Skylight Metrics Collection | Performance Counters Transmission | Server to Device |
| UDP | 162 | SNMP | SNMP Trap Sending | Server to Device |
| UDP | 1812 | RADIUS | User authentication and authorization | Server to Device |
| UDP | 514 | Syslog | Remote Syslog | Server to Device |
| UDP | 123 | NTP | Network Time Protocol Synchronization | Server to Device |
| UDP | 320 | PTP | Precision Time Protocol Synchronization | Device to master clock |
| TCP | 21 | FTP | File Transfers: - Configuration exports - Configuration imports - Firmware upgrades - SAT reporting - RFC-2544 report uploads | Device to Server; Server to Device |
| UDP | 69 | TFTP | File Transfers: - Configuration exports - Configuration imports - Firmware upgrades - SAT reporting - RFC-2544 report uploads | Device to Server; Server to Device |
| TCP | 990 | FTPS | File Transfers: - Configuration exports - Configuration imports - Firmware upgrades | Device to Server; Server to Device |
| TCP | 22 | SCP | File Transfers: - Configuration exports - Configuration imports - Firmware upgrades | Device to Server; Server to Device |
| TCP | 22 | SFTP | File Transfers: - Configuration exports - Configuration imports - Firmware upgrades - SAT reporting - RFC-2544 report uploads | Device to Server; Server to Device |
| TCP | 80 | HTTP | File Transfers: - Configuration exports - Configuration imports - Firmware upgrades | Device to Device |
| UDP | 862 | TWAMP | Two-Way Active Measurement Protocol | Device to Device |
| UDP | 6000 (see note) | TWAMP | Two-Way Active Measurement Protocol | Device to Device |
| UDP | 8000 (see note) | SAT | Y.1564 One-Way Test Communication | Device to Device |
| UDP | 9000 (see note) | SAT | Y.1564 One-Way Test Traffic | Device to Device |
| UDP, TCP | 53 | DNS | Domain Name System | Device to Server |
| UDP | 67 | DHCP | Automatic IP Assignment | Device to Server |
| UDP | 68 | DHCP | Automatic IP Assignment | Device to Server |
| UDP | 67 | Plug & Go | Layer-3 Beacon | Device to Device |
| UDP | 68 | Plug & Go | Layer-3 Beacon | Device to Device |
| UDP | 9065 | Plug & Go | Layer-3 Advertisement | Device to Device |
| TCP | 55000 | flow broker | flow broker server v1.x | Device to Client |
| TCP | 8793 | flow broker | flow broker server v2.x | Device to Client |

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