Siemens SIMATIC NET TeleControl S7-1200 CP 1243-1 Operating Instructions Manual page 35

Table: Meaning of the column titles and entries
The following table provides you with an overview of the open ports on this device.
● Protocol / function
Protocols that the device supports.
● Port number (protocol)
Port number assigned to the protocol.
● Default of the port
– Open
– Closed
●
– Open
– Open according to configuration
– Open (login, when configured)
– Closed after configuration
● Authentication
Specifies whether or not the protocol authenticates the communications partner during
access.
Protocol / function Port number (pro-
tocol)
DHCP 68 (UDP)
S7 and online 102 (TCP)
connections
Online security 8448 (TCP)
diagnostics
SMTP 25 (TCP)
can be set
SMTPS 465 (TCP)
(SSL/TLS)
can be set
STARTTLS 587 (TCP)
can be set
NTP 123 (UDP)
CP 1243-1
Operating Instructions, 12/2016, C79000-G8976-C365-02
The port is open at the start of the configuration.
The port is closed at the start of the configuration.
Port status
The port is always open and cannot be closed.
The port is open if it has been configured.
As default the port is open. After configuring the port, the communications partner
needs to log in.
The port is closed because the CP is always client for this service.
Default of the port
Closed
Open
Closed
Closed
Closed
Closed
Closed
Port status
Open after configuration (while the
CP obtains a new address)
Open after configuration *
Open after configuration
Closed after configuration
Closed after configuration
Closed after configuration
Closed after configuration
Configuration
4.1 Security recommendations
Authentication
No
No
No
No
Yes
No
No
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