Siemens CM 1542-1 - Network Security and Firewall Settings

Configuration, programming
4.1 Security recommendations
CM 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04
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● 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 after 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.
– Open with block call
The port is only opened when a suitable program block is called.
●
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
DCP
93 (UDP)
Open
Open
No
S7 communica-
tion
102 (TCP) Open Open No
HTTP
80 (TCP)
Closed
Open after configuration
No
SNMP
161 (UDP) Open Open No
PROFINET
34964 (UDP)
Open
Open
No
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:
● DHCP / 67, 68 (UDP)
● DNS / 53 (UDP)
● NTP / 123 (UDP)
● SMTP / 25 (TCP) - Open in CP on block call (outgoing only)