Nikon D4S - Manual (Page 13)

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Optional UT-1 Communications Units
In place of the built-in Ethernet port, an optional UT-1 communication
unit can be used to connect the camera to a local area network (LAN).
The UT-1 supports the same modes as the WT-4 and can be used with
Ethernet networks or combined with an optional WT-5 wireless
transmitter for connection to wireless networks.
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Ethernet Connection
Ethernet connections require no adjustments to wireless LAN settings.
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FTP Servers
Servers can be configured using standard ftp services, such as IIS (Internet
Information Services), available with supported operating systems. Image
transfer and camera control do not support connection to computers on
other networks via a router, Internet ftp connections and ftp servers running
third-party software.
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HTTP Sever Mode
Internet connections are not supported in http server mode.
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Routers
Connection to computers on other networks via a router is supported only
when FTP upload or HTTP server is selected.
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Firewall Settings
Ports 21 and 32768 through 61000 are used for ftp, ports 22 and 32768
through 61000 for sftp, while image transfer and camera control modes use
TCP port 15740 and UDP port 5353. File transfer may be blocked if the server
firewall is not configured to allow access to these ports.