Port 1164 TCP/UDP is officially assigned to QSM Proxy Service—a communication intermediary between Quantum Secure Modules (QSMs) and the applications that depend on them.1
What QSM Proxy Does
A Quantum Secure Module is specialized hardware designed to securely manage cryptographic keys and perform sensitive cryptographic operations within a protected environment. Think of it as a vault—not for money, but for the keys that protect everything else.
The QSM Proxy service sitting on port 1164 is the messenger. It facilitates communication between these hardware security modules and external applications that need to:
- Store and retrieve cryptographic keys
- Perform encryption/decryption operations
- Sign data without exposing private keys
- Generate random numbers in a provably secure way
The proxy exists because the QSM itself is isolated by design. Applications don't talk directly to the hardware—they talk through port 1164.2
Why This Port Matters
Most people will never encounter port 1164. It's not running on your laptop or your home router. It exists in data centers, financial institutions, government facilities—places where cryptographic key management isn't just important, it's legally mandated.
The traffic flowing through this port represents something genuinely critical: the management of keys that protect financial transactions, secure communications, authenticate users, and verify software hasn't been tampered with.
If an attacker could compromise a QSM, they wouldn't just steal data—they'd steal the ability to impersonate, decrypt, and forge. The hardware is designed to make that impossible. The proxy on port 1164 is the controlled gateway to that security.
Port 1165: The GUI Companion
Port 1164 has a sibling: port 1165 is assigned to QSM GUI Service.3 While 1164 handles proxy communication for applications, 1165 provides graphical interface access for administrators managing the quantum secure module.
Together, they form the control plane for hardware-based cryptographic security.
Security Considerations
Port 1164 is not a common target for attackers because:
- It's specialized — You won't find it running on general-purpose systems
- Access is restricted — Only authorized applications should be able to connect
- The hardware is hardened — QSMs are designed to resist physical and logical attacks
That said, if port 1164 is exposed on your network and you're not running a quantum secure module infrastructure, something is wrong. Either:
- A device is misconfigured and listening on this port by accident
- An application is masquerading as qsm-proxy (potential security risk)
- Someone registered a service on this port without realizing it was assigned
Checking What's Listening
On Linux/macOS:
On Windows:
If something is listening and you don't recognize it, investigate immediately.
The Registered Port Range
Port 1164 lives in the registered port range (1024–49151). This range is maintained by IANA for applications that have formally requested port assignments.4
Unlike well-known ports (0–1023), which require root privileges to bind, registered ports can be used by regular applications. This makes them practical for enterprise services like QSM Proxy, which don't need to be system-level services but still benefit from having a standardized port number.
The registration system exists so that two applications don't accidentally choose the same port and create conflicts. When you see port 1164 assigned to qsm-proxy, that's not a suggestion—it's a formal allocation recognized across the Internet.
Related Ports
- Port 1165 (TCP/UDP) — QSM GUI Service, administrative interface for quantum secure modules
- Ports in the 1160s range include various specialized enterprise services
Frequently Asked Questions About Port 1164
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