I could have sworn I answered the same question from someone last week, only that was for an LDAP server!!!
Work through the very detailed and well laid out documentation at
http://support.sas.com/rnd/itech/doc9/admin_ldap/publish/index.html which is called "Administering the Publishing Framework (Publish and Subscribe Planning and Implementation Guide)" and can be found by searching on LDAP and Publish on the support web site.
Kind regards
David