Is port 2404 (IEC 60870-5-104) dangerous?

Port 2404 is classified as critical risk and should not be exposed to the public internet. It transmits data without encryption, making it vulnerable to eavesdropping and credential theft.

Should port 2404 be open on my firewall?

No, port 2404 should not be open to the public internet. Block it at the firewall and use encrypted alternatives such as SSH, SFTP, or HTTPS instead.

What transport protocol does port 2404 use?

Port 2404 (IEC 60870-5-104) uses the TCP transport protocol and falls under the System & Infrastructure category.

:2404 (TCP)

IEC 60870-5-104

Critical Risk

TCP — System & Infrastructure

Port Overview

Port Number 2404

Service Name IEC 60870-5-104

Transport Protocol TCP

Category System & Infrastructure

Security Risk Critical

Port Range Registered (1024-49151)

What is Port 2404?

Port 2404 is used by IEC 60870-5-104, a standard protocol for telecontrol equipment in electrical power systems and SCADA infrastructure. Utility companies use this protocol to monitor and control remote electrical substations and power equipment. Security of this port is critical for protecting power grid infrastructure from cyberattacks.

TCP System & Infrastructure

Security Considerations

Port 2404 (IEC 60870-5-104) is classified as critical risk. This port should not be exposed to the public internet. The service transmits data without encryption, making it vulnerable to eavesdropping, credential theft, and man-in-the-middle attacks.

Recommendation: Block this port at the firewall. Use encrypted alternatives (SSH, SFTP, HTTPS) instead.

Related Ports — System & Infrastructure

0 Reserved 1 TCPMUX 2 Management Utility 3 CompressNET 4 Unassigned 5 RJE 6 Unassigned 7 Echo

Related Terms

Bandwidth Latency Packet Loss Ping Throughput ASN