Sun Microsystems Portal Server 6 2005Q1, Planning Manual

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Netlet
42 Portal Server 6 2005Q1 • Deployment Planning Guide
Dynamic applications agree upon a port for communication as part of the
handshake. You can include the destination server port as part of the Netlet rule.
The Netlet needs to understand the protocol and examine the data to find the port
being used between the client and the server. FTP is a dynamic port application. In
FTP, the port for actual data transfer between the client and server is specified
through the
PORT
command. In this case, the Netlet parses the traffic to obtain the
data channel port dynamically.
Currently, FTP and Microsoft Exchange are the only dynamic port applications
that Portal Server supports.
NOTE Although Microsoft Exchange 2000 is supported with Netlet, the
following constraints apply:
• You must configure Exchange to use STATIC ports.
• Netlet does not work with Windows 2000 and XP because
Windows 2000 and XP clients reserve the Exchange port (port
135) for the RPC Portmapper, which Active Directory uses.
Previous versions of Windows did not reserve this port. Because
the port is reserved, you cannot assign Netlet to it, and thus the
port cannot provide the necessary tunneling.
• The Outlook 2000 client has the limitation that it does not enable
you to change the port on which you want to connect to the
Exchange server.