Siemens Simatic Net Scalance M812 Operating Instructions Manual page 12

Security recommendations
The table includes the following columns:
● Protocol
All protocols that the device supports
● Port number
Port number assigned to the protocol
● Port status
– Open
– Open (when configured)
● Factory setting
– Open
– Closed
● Authentication
Specifies whether or not the protocol is authenticated during access.
With some protocols the port can be open but access is prevented by a predefined IP
package filter rule. You will find further information on the predefined IP package rules in
"Security > Firewall > Predefined IPv4"
Protocol
SSH
HTTP
HTTPS
SNTP
SNMP
DNS
Syslog
IPsec
DHCP
NTP
Siemens Remote Service
(cRSP/SRS)
PROFINET
12
The port is always open and cannot be closed.
The port is open if it has been configured.
The factory setting of the port is "Open".
The factory setting of the port is "Closed".
Port number Port status
TCP/22 Open (when configured)
TCP/80 Open (when configured)
TCP/443 Open
UDP/123 Open (only outgoing)
UDP/161 Open (when configured)
TCP/53 Open (when configured)
UDP/53 Open (when configured)
UDP/514 Open (only outgoing)
UDP/500 Open (when configured)
UDP/4500
UDP/67 Open (when configured)
UDP/68
UDP/123 Open (only outgoing)
TCP/443 Open (only outgoing)
UDP/34964 Open (when configured)
Factory setting
Internal External
interface interface
Open Closed
Open Closed
Open Closed
Closed Closed
Open Closed
Open Closed
Open Closed
Closed Closed
Closed Open
Open Closed
Closed Closed
Closed Closed
Closed Closed
Operating Instructions, 08/2016, C79000-G8976-C343-04
Authentication
Yes
Yes
Yes
No
Yes
No
No
No
Yes
No
Yes
Yes
No
SCALANCE M812, M816