452
Summary
- // typical exposure
- Internal-only — sfs-config is a legacy configuration-server channel for Cray Research Inc.'s cluster filesystem, meant for traffic inside an HPC cluster's internal network; nothing in the registry or research suggests it was designed for, or should ever be reachable from, the public internet.
- // analyst note
- An open port 452 outside a Cray/HPC cluster environment is unusual given the product's obscurity and narrow vendor scope; treat as anomalous or worth investigating rather than expected.
- // if you see it open
- No CVE, malware, or trojan association is recorded in the sources checked as of an August 2026 search. sfs-config is an obscure, legacy, vendor-specific (Cray Research Inc.) HPC cluster-filesystem configuration service with no evidence of contemporary or widespread deployment; given that obscurity and its narrow internal-cluster purpose, an open 452/tcp outside a Cray/HPC environment would be anomalous and worth investigating rather than expected.
About port 452/tcp.
Port 452/tcp carries sfs-config, IANA's registered name for the Cray SFS (Shared File System) configuration service; it is a legacy, vendor-specific Cray Research Inc. supercomputer HPC service with no legitimate reason to be reachable from the public internet.
IANA registers both 452/tcp and 452/udp under the name sfs-config, described only as "Cray SFS config server" and assigned to [Walter_Poxon]. No RFC or other standards-track reference is listed — this is a straightforward vendor registration rather than an IETF-defined protocol, and the registry's Reference column is blank.
The immediately adjacent port, 451 (tcp and udp), is registered as sfs-smp-net, the "Cray Network Semaphore server" — a second Cray SFS-family assignment sitting right next to this one, consistent with a small block of ports reserved together for the same product line. SFS was Cray Research Inc.'s Shared File System, described in Clavister's application-control signature documentation as a high-performance, HIPPI-based common system shared among CRI UNICOS systems only; the config-server role here would carry configuration traffic inside a cluster's internal network rather than general client traffic.
Nmap's open-frequency sampling, built into this project's port dataset from real-world scan data, puts 452/tcp at roughly 0.0013% and 452/udp at roughly 0.03% — both effectively negligible. No community-sourced reports (vendor documentation, blog posts, forum threads) of other software using this port turned up in an August 2026 search, so beyond the IANA registration itself, real-world usage of 452 stays unconfirmed.
- IANA assignment
sfs-config— "Cray SFS config server"; reference (blank — no RFC cited in IANA registry); assignee/contact [Walter_Poxon]; dual-registered 452/tcp + 452/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry sfs-config 452/tcp, sfs-config 452/udp- Range class
- well-known (0–1023); source artifact labels this the "system" range [Confirmed] — this site's own tooling (port 452 entry)
- Prevalence
- nmap-services open-frequency 452/tcp ≈ 0.000013 (~0.0013%); 452/udp ≈ 0.000297 (~0.03%) [Confirmed] — this site's own tooling (port 452 entry)
- Related ports
- 451/tcp+udp
sfs-smp-net(Cray Network Semaphore server) — immediately adjacent Cray SFS-family registration [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry sfs-smp-net 451/tcp
Primary use
Cray SFS (Shared File System) configuration service — a HIPPI-based shared filesystem used only among Cray Research Inc. (CRI) UNICOS systems; IANA-registered, not defined by an RFC
Other/unofficial uses
none found; no community-sourced (vendor docs/forums/blogs) sightings of other software on this port as of an August 2026 search [Unknown]
Security implications
no CVE, malware, or trojan association recorded in the sources checked as of an August 2026 search; obscure legacy vendor service with no evidence of contemporary widespread deployment
Typically seen on
legacy/niche Cray Research Inc. HPC or supercomputer cluster systems running the SFS product
- Analyst note
- An open port 452 outside a Cray/HPC cluster environment is unusual given the product's obscurity and narrow vendor scope; treat as anomalous or worth investigating rather than expected.
About port 452/udp.
Port 452/udp carries sfs-config, IANA's registered name for the Cray SFS (Shared File System) configuration service; it is a legacy Cray Research supercomputer infrastructure protocol with no legitimate reason to be reachable from the public internet.
IANA registers sfs-config on both 452/tcp and 452/udp with the description "Cray SFS config server," assignee Walter_Poxon, and a blank Reference field — no RFC or formal specification is cited, and the registry carries no registration or modification date.
Per third-party application-control signature documentation (Clavister), SFS is a HIPPI-based shared filesystem used only among Cray Research Inc. (CRI) UNICOS systems — legacy 1990s-era supercomputer cluster storage infrastructure, not general-purpose software. No independent source describes any broader, non-Cray, or modern use.
No community-sourced sightings of other software on 452/udp were found; port-list mirror sites (t1shopper, SpeedGuide, adminsub.net, Cisco NBAR protocol-pack docs) all just repeat the IANA "Cray SFS config server" label, with no divergent application ever reported by any source checked.
nmap-services measures 452/udp open-frequency at 0.000297 (about 0.03% of scanned hosts) and 452/tcp at 0.000013 (about 0.001%) — both negligible. No CVE is recorded and no malware or trojan family is documented against 452/udp as of an August 2026 search.
- IANA assignment
sfs-config— "Cray SFS config server"; Reference column blank (no RFC cited); Assignee [Walter_Poxon]; dual-registered 452/tcp + 452/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry sfs-config 452/udp, the IANA Service Name and Transport Protocol Port Number Registry sfs-config 452/tcp- Range class
- well-known (0–1023); source artifact labels this the "system" range [Confirmed] — this site's own tooling (port 452 entry)
- Prevalence
- nmap-services open-frequency 452/udp = 0.000297 (~0.03%); 452/tcp = 0.000013 (~0.001%) [Confirmed] — this site's own tooling
- Related ports
- 452/tcp (dual registration, same sfs-config name and description) [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry sfs-config 452/tcp
Primary use
Cray SFS (Shared File System) configuration service — a HIPPI-based shared filesystem used only among Cray Research Inc. (CRI) UNICOS systems
Other/unofficial uses
none corroborated as of an August 2026 search; port-list mirror sites only repeat the IANA description with no divergent application reported
Security implications
no CVE recorded and no malware/trojan association documented against 452/udp as of an August 2026 search; no SANS ISC or comparable scan-prevalence entry exists for port 452 specifically, and auditmypc.com's port-452 page could not be retrieved (HTTP 403) so it is not cited for this finding [Unknown]
Typically seen on
legacy Cray Research UNICOS supercomputer deployments running the SFS shared-filesystem product; effectively obsolete in modern (2026) infrastructure
- Analyst note
- treat an open 452/udp as a legacy Cray SFS configuration channel — investigate if seen outside a Cray UNICOS cluster context; real-world exposure in 2026 is expected to be negligible given the platform's obsolescence.
Service assignments.
| Name | Protocol | Description | Open frequency |
|---|---|---|---|
| sfs-config | UDP | Cray SFS config server | 0.03% |
| sfs-config | TCP | Cray SFS config server | 0.00% |
Service assignments from the IANA Service Name and Transport Protocol Port Number Registry, with open-frequency data from nmap-services.