Siemens SIMATIC NET ET 200SP Operating Instructions Manual page 52

Configuration
4.1 Security recommendations
Table 4- 1 Server ports (all three CP types)
Protocol / function Port number (pro-
tocol)
DHCP 68 (UDP)
S7 and online con- 102 (TCP)
nections
HTTP 80 (TCP)
HTTPS 443 (TCP)
SNMP 161 (UDP)
* Some service providers consider the opening of port 102 a security vulnerability.
To avoid opening the port during online diagnostics, see section Online security diagnostics
via port 8448 (CP 1542SP-1 IRC, CP 1543SP-1) (Page 90).
Table 4- 2 Server ports - only CP 1542SP-1 IRC and CP 1543SP-1
Protocol / function Port number (pro-
tocol)
Online diagnostics 102 (TCP)
Communication via 443 (TCP)
SINEMA RC
Syslog 514 (UDP)
Table 4- 3 Server ports - only CP 1542SP-1 IRC
Protocol / function Port number (pro-
tocol)
DNP3 20000 (TCP/UDP)
can be set
IEC 60870-5-104 2404 (TCP)
can be set
52
Default of the Port status
port
Closed Open after configuration (while the
CP obtains a new address)
Closed Open after configuration *
Closed Open after configuration
Closed Open after configuration
Open Open after configuration
Default of the Port status
port
Closed Open after configuration
Closed Open after configuration
Closed Open after configuration
Default of the Port status
port
Closed Open after configuration
Closed Open after configuration
Operating Instructions, 12/2019, C79000-G8976-C426-05
Authentication
No
No
Yes
Yes
Yes (with SNMPv3)
Authentication
No
Yes
No
Authentication
Yes, when Secure
Authentication is ena-
bled.
No
CP 154xSP-1