Johan, The PAN firewall does not directly participate in Kerberos authentication of clients, it relays the requests from the client to the servers that are configured in your Kerberos authentication profile. Consequently, no trust needs to be established with the firewall, as both members will have the keys necessary as they are both in the same domain. Also, TGT renewal requests will be renewed by the end user's workstation. If you would like more information on Kerberos, please follow this link to Microsoft's TechNet: http://technet.microsoft.com/en-us/library/cc961976.aspx
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