Siemens ET 200SP Operating Instructions Manual page 41

● 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
Secure and non-secure protocols
● Only activate protocols that you require to use the system.
● Use secure protocols when access to the device is not prevented by physical protection
measures.
The NTP protocol provides a secure alternative with NTP (secure).
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 according to configuration
– Open (login, when configured)
– Closed after configuration
● Authentication
Specifies whether or not the protocol authenticates the communications partner during
access.
CP 1542SP-1, CP 1542SP-1 IRC, CP 1543SP-1
Operating Instructions, 01/2017, C79000-G8976-C426-03
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.
Configuration and operation
4.1 Security recommendations
41