If you don't already have a Radius server installed then I'd go with LDAP. Matthew Shrewsbury, MCSE+Internet MCSE 2000 CCA Server+ Senior Network Administrator -----Original Message----- From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of tony.mcphail@xxxxxxxxxxxxxxxxxxxxx Sent: Monday, February 13, 2006 6:27 AM To: Thin List Subject: [THIN] CAG + ACC 4.2 Hi all I am trying to setup a Citrix Access Gateway device with Advances Access Control 4.2. I want to use our W2K3 AD to authenticate the users. Does anyone have an opinion on whether to use LDAP or Radius? Tony McPhail IT Technical Manager The Salvation Army Australia Southern Territory http://www.salvationarmy.org.au/home.asp