Port 102 — ISO-TSAP / Siemens S7
Quick reference for TCP/UDP port 102, used by ISO-TSAP / Siemens S7. Includes what the service does, security guidance and related ports.
What is port 102?
Used by Siemens S7 industrial controllers (PLCs).
What port does ISO-TSAP / Siemens S7 use?
ISO-TSAP / Siemens S7 listens on port 102 by default.
Security guidance
High risk — do not expose to the internet
Port 102 (ISO-TSAP / Siemens S7) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Frequently asked
What is port 102 used for?+
Port 102 is the standard TCP/UDP port for ISO-TSAP / Siemens S7. Used by Siemens S7 industrial controllers (PLCs).
What port does ISO-TSAP / Siemens S7 use?+
ISO-TSAP / Siemens S7 listens on port 102 by default.
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