thanks every one. The probleme was that in http.conf I used the IP adresse of FDS in AuthLDAPURL. I must use the fully qualified domain name like the cn attribut of the certificat of FDS. So it's OK. _________________________________________________________________ Windows Live Mail : venez tester la version b?ta ! http://www.ideas.live.com/programpage.aspx?versionId=5d21c51a-b161-4314-9b0e-4911fb2b2e6d