534

Port 534/tcp is registered with IANA for windream, described as "windream Admin" — the administrative/management channel for windream, an Enterprise Content Management (ECM) / Document Management System built by German developer windream GmbH (now part of dataglobal Group). It has a legitimate but narrow purpose and should stay restricted to trusted internal or VPN-connected networks rather than sit open to the public internet.

IANA's Service Name and Transport Protocol Port Number Registry lists 534 as dual-registered on both TCP and UDP under the name windream, with assignee/contact Uwe Honermann; the Reference field is blank, so no RFC or formal specification backs the assignment, and no registration or modification date is present in the fetched registry excerpt.

windream integrates documents into Windows Explorer through a Virtual File System, and the "Admin" description implies this port carries administrative or management traffic for that platform rather than end-user document access. No vendor technical document was located that explicitly confirms TCP 534 as windream's live admin-console listener in current deployments, so that operational detail is Likely rather than Confirmed.

The prevalence corpus at this site's own tooling (built from nmap-services) records an open-frequency of exactly 0 for 534/tcp — a real sampled reading of "not observed open," not an absence — filed there under an older nmap-services label, "mm-admin" (MegaMedia Admin), that predates IANA's reassignment of this port to windream. The 534/udp row in the same corpus carries a nonzero frequency of about 0.038% under that same legacy label.

No CVE or malware/Trojan association was found tied to this port as of an August 2026 search; auditmypc.com's port-534 page carries no positive virus/Trojan verdict. General port-directory sites list the port but only restate the IANA windream assignment, and no forum, blog, or support thread reporting other software using TCP 534 turned up in that search.

Exposure

windream Admin is a management channel for an ECM/DMS product; treat it like other admin-facing services and restrict it to trusted internal or VPN-connected networks rather than exposing it publicly.

Registry basis

IANA registers 534/tcp and 534/udp both as windream, assignee Uwe Honermann, with a blank Reference field — no RFC backs the assignment.

Known CVE/malware

None found tied to port 534 as of an August 2026 search; auditmypc.com records no Trojan/virus verdict for it.

Prevalence

this site's own tooling records an nmap-services open-frequency of 0 for 534/tcp, filed under the legacy "mm-admin" label — a sampled non-open reading, not an absence.

IANA assignment

windream — "windream Admin"; reference blank; assignee Uwe Honermann; dual-registered 534/tcp + 534/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry windream 534/tcp

Range class

well-known (0–1023) [Confirmed] — IANA registry port-number range

Registration/modification dates

not present in the fetched IANA registry excerpt for this entry; left null rather than fabricated [Unknown]

Prevalence

nmap-services open-frequency for 534/tcp = 0 (sampled non-open reading, filed under the legacy "mm-admin" label); 534/udp ≈ 0.000379 under the same legacy label [Confirmed] — this site's own tooling

Related ports

none directly identified

Primary use

administrative/management channel for windream, an ECM/DMS product (windream GmbH / dataglobal Group) that exposes documents via a Windows Explorer-integrated Virtual File System

Other/unofficial uses

none found; the legacy nmap-services corpus labels this port's tcp row "mm-admin" (MegaMedia Admin), an older name predating the IANA windream reassignment

Security implications

no CVE or malware association found as of an August 2026 search; auditmypc.com carries no Trojan/virus verdict for this port

Typically seen on

hosts running windream ECM/DMS software, in an administrative/management context; not expected on general-purpose servers [Likely]

Analyst note

an open port 534 most plausibly indicates a windream ECM/DMS deployment's admin channel; restrict it to trusted/internal access rather than exposing it publicly.

Port 534/udp carries windream Admin, the client-server administration channel for the windream enterprise content-management (ECM) system; it belongs on an internal, managed network rather than exposed to the public internet.

IANA registers the service name windream on both 534/tcp and 534/udp with the description "windream Admin," assignee Uwe Honermann, and a blank Reference field — no RFC backs this assignment, which is typical for vendor-registered application ports rather than IETF-standard protocols.

windream is an ECM/document-management product from dataglobal Group (formerly windream GmbH). Vendor-adjacent firewall guidance describes port 534 as "the windream TCP-Service-Port," with 534 as the setup default, to be opened between windream clients and servers — distinct from the unrelated DCOM port 135.

The nmap-services frequency data (built from nmap-services) records an open-frequency of 0.000379 (~0.038%) for 534/udp — a real, low but nonzero measured figure. That underlying nmap-services row is labeled "mm-admin"/"MegaMedia Admin" rather than "windream," a naming inconsistency inside that legacy corpus, not a separate or conflicting current IANA assignment.

Exposure

Restricted — windream Admin is an administrative channel for an ECM/DMS product; the vendor's firewall guidance is a client-to-server allowlisting document, so it belongs limited to trusted networks rather than exposed to the public internet. This matches the 534/tcp sibling on the same page.

Malware

no malware or trojan association was found in NVD or vendor sources as of an August 2026 search.

CVE

no CVE was found recorded in the NVD for this port as of an August 2026 search.

Prevalence signal

measured open-frequency of 0.000379 for 534/udp is consistent with a low-volume enterprise application rather than a broadly deployed or default-open service.

IANA assignment

windream — "windream Admin"; reference (blank); assignee Uwe Honermann; dual-registered 534/tcp + 534/udp [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry windream 534/udp

Range class

well-known (0–1023) [Confirmed] — the IANA Service Name and Transport Protocol Port Number Registry windream 534/udp

Prevalence

nmap-services open-frequency for 534/udp = 0.000379 (~0.038%), per this site's own tooling; the frequency row is labeled "mm-admin"/"MegaMedia Admin" in that file rather than "windream" [Confirmed] — this site's own tooling

Related ports

534/tcp (paired windream Admin registration, same IANA entry)

Primary use

windream Admin channel for the windream ECM (document-management) product's client-server communication

Other/unofficial uses

none documented beyond windream deployments [Unknown]

Security implications

no CVE or malware association found; no port-534-specific exposure/scanning data found, as of an August 2026 search [Unknown]

Typically seen on

windream ECM server and client hosts on corporate networks

Analyst note

An open 534/udp is most plausibly windream ECM admin traffic; because ECM systems often manage sensitive corporate documents, unexpected exposure to the public internet is worth investigating rather than assumed benign.