Configuration and operation
4.1 Security recommendations
CP 1542SP-1, CP 1542SP-1 IRC, CP 1543SP-1
Operating Instructions, 01/2017, C79000-G8976-C426-03
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.
●
Protocols that the device supports.
●
Port number assigned to the protocol.
●
– Open
The port is open at the start of the configuration.
– Closed
The port is closed at the start of the configuration.
●
– Open
The port is always open and cannot be closed.
– Open according to 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.
– Closed after configuration
The port is closed because the CP is always client for this service.
●
Specifies whether or not the protocol authenticates the communications partner during
access.
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