Siemens SIMATIC NET S7-400 - Page 45

Configuration and operation
6.1 Security recommendations
CP 443-1 (EX30)
Manual, 03/2019, C79000-G8976-C255-05
45
● Make sure that all passwords are protected and inaccessible to unauthorized personnel.
See also the preceding section for information on this.
● Do not use one password for different users and systems.
Protocols
List of available protocols
The following is a list of all available protocols and their ports through which the device can
be accessed.
Service/
Protocol
Protocol/
port number
Default port
status
Configurable
Authentication
Encryption
Service
Port
TCP Modbus
TCP/502
Closed
✓
--
No
No
S7 protocol
TCP/102
Open
--
--
No
No
SNMP
UDP/161 Open ✓ -- No No
HTTP
TCP/80
Open
✓
--
No
No
PROFINET
CM
UDP/34964 Open -- -- No No
PROFINET
UDP 2/x
UDP/49152-65535 Open -- -- No No
Explanation for table:
●
Service/Protocol
Protocols that the device supports.
●
Protocol/port number
Port number assigned to the protocol.
●
Default port status
– Open
The port is open at the start of the configuration.
– Closed
The port is closed at the start of the configuration.
●
Configurable port
– ✓
The port can be configured.
– --
The port cannot be configured