Dear All I have configured two nodes Active/Passive Cluster Exchange servers.I install windows (2003+Sp1) Ent. on both servers and Exchange(2003+Sp1) Ent. - ClustSrv --> Virtual Cluster Name -->192.168.100.1 - ExchV --> Virtual Exchange Server Name-->192.168.100.2 - Node1 --> Exchange Server node1-->192.168.100.3 - Node2 -->Exchange Server node2 -->192.168.100.4 All clustered tests (Windows Cluster and Exchange Cluster) were done successfully(Failover, send and receive using POP3,IMAP4,MAPI Clients) only when i test the OWA it give me access deny.(using administrator account) I test it from one of the node browser from domain controller and also from the ESM HTTP Virtual Server (write click then browse HTTP Virtual Server ) it ask me for user name and password and after three times it gave me Access Deny (i use administrator account as Exchange and Windows Cluster Installation/Configuration). No FE server and no firewall installed yet,All Exchange Cluster resources are on (Exch System.Attendant ,MAT,HTTP Virtual Server Instance POP3 ,......) Can any body advise Thanks --------------------------------- Yahoo! Sports Rekindle the Rivalries. Sign up for Fantasy Football