If you are having trouble getting Kerberos to work with Access Connect, use the following troubleshooting steps:
To verify that a client computer has communicated successfully with the Kerberos ticket authority and received a ticket for Access Connect, run the Kerberos application located in /System/Library/CoreServices. The active Kerberos tickets are listed in Kerberos.app.In addition, the Kerberos application can be used to destroy existing tickets before their normal expiration time.
To verify that a client computer is bound to the Active Directory Domain correctly and is running the right version of Kerberos modules, try connecting to the server from the Macintosh over SMB instead of AFP by typing smb://SERVER_NAME into the Server Address field in the Connect To Server dialog. If you are required to log in then you will know that there is a general problem with Kerberos.