Hello, I have the following problem, and I'm out of idea :-( : I have an ISA Server, configured as Reverse Proxy, in DMZ (Firewall is not an ISA Server) This server publish the content of an another website, located in LAN. HTTPS and authentication are enabled for this access. Authenticated users are from My Windows Domain, not from local server. (My ISA server is on a W2K server, integrated to my DOMAIN and all corrects ports are open on my Firewall (following a note from Microsoft). All is functioning correctly... but only time to time. When I make a request on my website (from an external connexion), I receive authentication windows but, when I try to connect with a user, sometimes it's OK, sometimes it's KO. When it's OK with the first user, I can try with a second one... and OK or KO are possible. When it's KO with the first user, I can try with a second one... and OK or KO are possible. Is anybody has a suggestion for me ? Thank you in advance Etienne ________________________________________________ Goetynck Etienne System Engineer Email : Etienne.Goetynck@xxxxxxx Business Solutions Builders website : http://www.bsb.com Place de l'université, 25 B-1348 Louvain-la-Neuve Belgium Phone : +32 (0)10 48.34.93 Fax : +32 (0)10 48.34.99 ________________________________________________