Siemens SIMATIC S7-300 Equipment Manual page 45

• Default of the port
– Open
– Closed
•
– Open
– Open after configuration
– Open (login, when configured)
– Open with block call
• Authentication
Specifies whether or not the protocol authenticates the communications partner during
access.
Protocol / Port number
function (protocol)
S7 and online 102 (TCP)
connections
HTTP 80 (TCP)
SNMP 161 (UDP)
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.
These can be:
• NTP / 123 (UDP)
• DNS / 53 (UDP)
• DHCP / 67, 68 (UDP)
CP 343-1 Lean
Equipment Manual, 01/2023, C79000−G8976−C198−09
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 only opened when a suitable program block is called.
Default of the
port
Open
Closed
Open
Port status
Open after configuration
Open after configuration
Open after configuration
Configuration and operation
6.1 Security recommendations
Authentication
No
No
Yes (with SNMPv3)
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