Reference Guide

Table 2. Appliance network ports (continued)
Port Service Protocol Access Direction Description
9443 SupportAssist TCP Outbound Required for SupportAssist REST API
related to Connect Home.
Appliance network ports related to file
The following table outlines the collection of network ports and the corresponding services that may be found on the appliance
related to file.
NOTE: Outbound ports are ephemeral.
Table 3. Appliance network ports related to file
Port Service Protocol Access Direction Description
20 FTP TCP Outbound Port used for FTP data transfers. This
port can be opened by enabling FTP.
Authentication is performed on port 21
and defined by the FTP protocol.
21 FTP TCP Inbound Port 21 is the control port on which the
FTP service listens for incoming FTP
requests.
22 SFTP TCP Inbound Allows alert notifications through SFTP
(FTP over SSH). SFTP is a client/server
protocol. Users can use SFTP to perform
file transfers on an appliance on the local
subnet. Also provides outgoing FTP
control connection. If closed, FTP will not
be available.
53 DNS TCP/UDP Outbound Used to transmit DNS queries to the DNS
server. If closed, DNS name resolution will
not work. Required for SMB v1.
88 Kerberos TCP/UDP Outbound Required for Kerberos authentication
services.
111 RPC bind (for
SDNAS
namespaces;
otherwise, host
service)
TCP/UDP Bi-directional Opened by the standard portmapper or
rpcbind service and is an ancillary
appliance network service. It cannot be
stopped. By definition, if a client system
has network connectivity to the port, it
can query it. No authentication is
performed.
123 NTP UDP Outbound NTP time synchronization. If closed, time
will not be synchronized among
appliances.
135 Microsoft RPC TCP Inbound Multiple purposes for MicroSoft Client.
Also used for NDMP.
137 Microsoft Netbios
WINS
UDP; TCP/UDP Inbound; Outbound The NETBIOS Name Service is associated
with the appliance SMB file sharing
services and is a core component of that
feature (Wins). If disabled, this port
disables all SMB related services.
138 Microsoft Netbios
BROWSE
UDP Outbound The NETBIOS Datagram Service is
associated with the appliance SMB file
sharing services and is a core component
of that feature. Only Browse service is
28 Communication security settings