Siemens SIMATIC NET TeleControl S7-1200 CP 1243-1 - Page 35

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