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Security recommendations
2.2 Available services
Service
DHCPv4 Cli‐
ent
DHCPv6 Cli‐
ent
DHCPv4-
Server
DNS Client
DNS Server
DynDNS
HTTP
HTTP Proxy
HTTPS WBM
Server/Client
IPsec/IKE
NTP Client
NTP Client
(secure)
NTP Server
NTP Server
(secure)
OpenVPN
Ping
PROFINET
RADIUS Cli‐
ent
SFTP Server
Siemens Re‐
mote Serv‐
ice (cRSP/
SRS)
20
Protocol/
Default port status
Port number
Local access
UDP/68
Closed
3)
TCP/546
Open
UDP/546
UDP/67
Closed
TCP/53
Outgoing only Outgoing on‐
UDP/53
TCP/53
Open
5)
UDP/53
TCP/80
Outgoing only Outgoing on‐
UDP/80
TCP/443
UDP/443
TCP/80
Open
TCP/3128
Outgoing only Outgoing on‐
TCP/8080
TCP/443
Open
UDP/500
Closed
UDP/4500
UDP/123
Outgoing only Outgoing on‐
UDP/123
Outgoing only Outgoing on‐
UDP/123
Closed
UDP/123
Closed
UDP/1194
Outgoing only Outgoing on‐
TCP/1194
ICMP
Open
UDP/34964
Open
UDP/49154
UDP/49155
UDP/1812
Closed
UDP/1813
TCP/22
Outgoing only Outgoing on‐
TCP/443
Outgoing only Outgoing on‐
Configurable
External ac‐
Port
Serv‐
cess
1)
Closed
--
Open
--
Closed
--
4)
--
ly
Closed
--
--
ly
Closed
✓
✓
ly
Closed
✓
Closed
--
✓
ly
✓
ly
Closed
✓
Closed
✓
✓
ly
Closed
--
Closed
--
Closed
✓
✓
ly
--
ly
Operating Instructions, 02/2023, C79000-G8976-C331-12
Authenti‐
Encryp‐
cation
tion
ice
✓
--
--
--
--
--
✓
--
--
✓
--
--
✓
--
--
✓
✓
--
✓
✓
--
✓
Optional
--
✓
✓
✓
✓
✓
✓
✓
--
--
✓
✓
--
✓
--
--
✓
✓
--
✓
✓
✓
✓
--
--
✓
--
--
✓
✓
Optional
--
✓
✓
✓
✓
Optional
✓
SCALANCE M874, M876
2)
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