# documentation:2.0:applications:adfs
Keywords: documentation,2.0,applications,adfs

# Active Directory Federation Services

## Presentation

Microsoft ADFS (Active Directory Federation Services) is an Identity/Service Provider, compatible with several protocols, including SAML 2.0.

This documentation does not explains how to setup ADFS, but give only tricks to make it works with LL::NG

## ADFS as Identity Provider

When ADFS is declared as an Identity Provider in LemonLDAP::NG, you need to take care of the following items:

- HTTPS is mandatory on LL::NG portal
- You need to use a certificate in LL::NG SAML metadata instead of a raw public key
- Activate option `Use specific query_string method` in SAML Service
- Use SHA1 instead of SHA256 as signature algorithm on ADFS if using a Lasso version < 2.5.0
- Force SAML response to be sent by POST and not Artifact (signature verification fails with Artifact)
- Enable `Allow proxy authentication` in IDP options on LL::NG side