Ports the storage system may contact
The storage system functions as a network client in several circumstances, for
example, in communicating with an LDAP server. In these instances, the storage
system initiates communication and the network infrastructure will need to support
these connections. Table 11 on page 39 describes the ports that a storage system
must be allowed to access for the corresponding service to function properly. This
includes the Unisphere CLI.
Table 11 Network connections that may be initiated by the storage system
Service Protocol Port Description
FTP TCP 20 Port used for FTP data transfers. This port can be opened by
enabling FTP as described in the next row. Authentication is
performed on port 21 and defined by the FTP protocol.
SFTP TCP 22 Allows alert notifications through SFTP (FTP over SSH).
SFTP is a client/server protocol. Users can use SFTP to
perform file transfers on a storage system on the local subnet.
Also provides outgoing FTP control connection. If closed, FTP
will not be available.
SSH/SSHD, VSI TCP 22 Allows SSH access (if enabled). Also used for VSI plugin. If
closed, management connections using SSH and VSI plugin
will not be available.
SMTP TCP 25 Allows the system to send email. If closed, email notifications
will be unavailable.
DNS TCP/UDP 53 DNS queries. If closed, DNS name resolution will not work.
DHCP UDP 67-68 Allows the storage system to act as a DHCP client. If closed,
dynamic IP addresses will not be assigned using DHCP.
HTTP TCP 80 Redirect for HTTP traffic to Unisphere and the Unisphere CLI.
If closed, management traffic to the default HTTP port will be
unavailable.
Kerberos TCP/UDP 88 Provides outgoing Kerberos ticket. If closed, Kerberos
authentication and all protocols that use it; for example, SMB,
LDAP, GPO, secNFS, and such, will not be available.
Portmapper,
rpcbind (Network
infrastructure)
TCP/UDP 111 Opened by the standard portmapper or rpcbind service and is
an ancillary storage system 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.
NTP UDP 123 NTP time synchronization. If closed, time will not be
synchronized among arrays.
NETBIOS Name
Service (SMB)
TCP/UDP 137 The NETBIOS Name Service is associated with the storage
system SMB file sharing services and is a core component of
that feature (Wins). If disabled, this port disables all SMB-
related services.
Communication Security
Ports the storage system may contact 39
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