Answer for:

Unable to connect to Exchange Server thru Cisco VPN

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If your system is not a member of the domain into which you are being granted access via VPN, that is normal and expected behavior.

Active Directory uses Kerberos to pass both user and computer authentication requests for network assets.

To use Kerberos authentication, your system has to be a member of the domain, so the domain controllers can give you a token to present to the server holding the asset.