Hi, Running a 2 node CAS 2010 setup. For testing purposes i shutdown node a and watch if outlook is reconnecting. When outlook reconnects i get a login prompt. When i enter credentials i get redirect to other CAS. It seems failover is working but why the login prompt. Clients or non cache outloko 2007 sp2 clients in a AD domain. Thanks Ivan

NLB cannot transfer HTTP session states when it's rebooted. You need to plan ahead and do a drainstop long enough before the planned reboot to minimized impact to users.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

ok so i can of failure people should relogon?Ivan

Yes. For DAG fail overs users won't get prompted since they connect to the CAS array, but rebooting the CAS server kills their HTTP session.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com