Reboot a CAS array member causes Outlook 2010 clients to prompt for credentials.

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C

Corbett Enders

Setup has a 2 member front-end CAS Array running Exchange 2010 with NLB for load balancing.

2 member DAG group hosting the mailboxes.

If I reboot a CAS array member, many (but not all) of our Outlook clients are prompted to enter their credentials. I don't believe this should happen, can someone point me in the right direction to resolve this?
 
C

Chris Morgan - Presidio

is it the same clients each time that get prompted? is it the same server that gets rebooted or this happens no matter which one you reboot? Are all clients a part of the domain and are they logged into the domain when using outlook?
 
A

AndyD_ [MVP]

NLB is not application aware.

I recommend doing a drainstop on the node you wish to reboot prior to the scheduled outage and give it enough time to minimize the number of affected users. Use perfmon to see view the amount of connected users and monitor. Once it reaches an acceptable level, stop the node and reboot.

User in cache mode should be the least affected.
 
C

Corbett Enders

Andy I suspect you are right... we'll try that the next time I feel the need to reboot a CAS server.

Chris, it happens to random users. All clients are on logged into workstations that are part of the domain using domain credentials.

I likely won't get to test this for some time... we rarely reboot our servers mid-day.
 
B

bodybybody

This is a work around, is there a solution? Windows updates, emergency reboots, monthly reboots etc. all the time at 3, 4 am in the morning.

2 CAS array

F5 LTM load balancer

2500 mailboxes

Thanks

Scott
 
S

SR_

Are these NLB running in Multicast or Unicast mode?

Multicast the recommended meathod of NLB

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