HSCN technical guidance


Guidance, policy and best practice documents covering all technical aspects of HSCN. Documents on this page will be regularly reviewed and updated by NHS Digital as required.


HSCN ANM firewall change requests

Any end-user organisation requiring a firewall change to the HSCN ANM service to access non-standard ports/protocols for business-critical reasons must complete the HSCN ANM firewall change request form.

Once completed, this must be submitted to the NHS Digital Data Security Centre for assessment. The impact of the change will be assessed and a decision will be made to approve or not. Any successful requests will be forwarded to the ANM supplier for action.

The NHS Digital National Service Desk will feedback all resolutions via the local service desk support route.

The completed form should be sent to the NHS Digital National Service Desk via the end user organisation's local service desk route rather than via the CN-SP.

HSCN QoS change request form

To request a change to a QoS configuration, download the change request form.

On the form, provide as much detail as you can, including: full contact details; information about the application and the reason for the configuration change; and the QoS class, IP address, and port/protocol (if applicable).

Email the completed change request form to the NHS Digital National Service Desk (NSD).

For further details and guidance see HSCN QoS - change requests and end-to-end configuration.

Policies and guidance

IP addressing

HSCN IP address management

Find all information relating to IP address management under HSCN, including the HSCN IP addressing policy, IP addressing good practice guidelines, IPAM process and change request forms.

Quality of Service (QoS)

HSCN Quality of Service overview

Quality of Service (QoS) is a set of techniques to manage resources within a communications network. This page provides details of QoS implementation across HSCN and includes the HSCN QoS policy.

HSCN QoS - change requests and end-to-end configuration

This page provides details of the HSCN configuration change requests process and QoS change request form.


HSCN/Transition Network DNS

This document provides an overview of DNS on HSCN and TN and the DNS change request process

Transition Network guidance for DNS local forwarding and server configuration

This document is intended for NHS 'end-user' organisations connected to the Transition Network (TN), who have opted for local DNS provision.

Other guidance

Maintaining access to internet services after migrating to HSCN

An explanation of how the Transition Network and HSCN use IP addresses to restrict access to authorised users and how they access services and applications over the internet.

Migrating an existing Transition Network VPN to HSCN

Guidance and considerations for migrating any existing virtual private networks set up on the Transition Network to HSCN.

HSCN connectivity options

HSCN will create the effect of a single network across health and social care providers and their partners. This page provides guidance and details of some of the connectivity options and network designs suitable for different organisations and business requirements. 

Troubleshooting guide - HSCN IP network connectivity

This guidance document provides a step by step guide to using specific tools and techniques that will resolve or rule out issues that commonly cause network connectivity problems.

HSCN business applications guidance

This document provides guidance on procuring standard business applications to replace N3 overlays.