Siemens SIMATIC TeleControl DNP3 Configuration Manual page 31

● 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
(protocol)
DNP3 20000 (UDP)
S7 and online 102 (TCP)
connections
Online security 8448 (TCP)
diagnostics
(CP 1243-x /
CP 1542SP-1 IRC)
HTTP 80 (TCP)
HTTPS 443 (TCP)
SNMP 161 (UDP)
* For information on avoiding opening port 102 during diagnostics, see section Online
security diagnostics via port 8448 (CP) (Page 135).
Ports of communication partners and routers
Make sure that you enable the required client ports in the corresponding firewall on the
communications partners and in intermediary routers.
Configuration - DNP3
Configuration Manual, 11/2018, C79000-G8976-C508-01
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 module is always client for this service.
Default of the port
Closed
Open
Closed
Closed
Closed
Closed
Port status
Open after configuration
Open after configuration *
Open after configuration
Open after configuration
Open after configuration
Open after configuration
Configuration
3.1 Security recommendations
Authentication
Yes, when secure
authentication is ena-
bled.
No
Yes
No
Yes
Yes (with SNMPv3)
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