Siemens CP 1243-1 Operating Instructions Manual page 39

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 after 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)
DNP3 listener 20000 (TCP)
port
IEC listener port 102 (TCP)
S7 and online 2404 (TCP)
connections
Online security 8448 (TCP)
diagnostics
HTTP 80 (TCP)
HTTPS 443 (TCP)
SNMP 161 (UDP)
* For information on avoiding opening the port during diagnostics, see section Online
security diagnostics via port 8448 (Page 123).
CP 1243-1
Operating Instructions, 04/2017, C79000-G8976-C365-03
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
Closed
Open
Closed
Closed
Closed
Open
Port status
Open after configuration
Open after configuration
Open after configuration *
Open after configuration
Open after configuration
Open after configuration
Open after configuration
Configuration
4.1 Security recommendations
Authentication
No
No
No
No
No
Yes
Yes (with SNMPv3)
39