Clients of Exchange 2010 need to re-login after a Client Access Server failover

When a Client Access Server (CAS) server fails over, OWA users need to re-authenticate and Outlook users need to close Outlook and open it again to get connected to a new CAS server.

To fix this issue, implement Kerberos authentication in Exchange 2010 (requires SP1 or higher). Microsoft articles about this can be found at the following links:

The default authentication mechanism in Exchange 2010 is NTLM and due to the way that the CAS Array is designed this causes the need for users to re-authenticate when the CAS server fails over. This is expected.

In order to avoid this, it is required that Kerberos authentication is configured and also that Exchange 2010 SP1 or higher is in use. Information on how this behavior occurs can be found on the Microsoft website.

Additional information can be found at the following links:

 

 

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