Port 28000NX License Manager

Used by Siemens NX floating-license servers, typically through FlexNet Publisher; keep the license service on a trusted network.

inNetwork Services System

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 4/10
lookups: 0

also known as nxlmd, ugslmd, Siemens PLM License Server, FlexNet Publisher

1 other service is registered on port 28000. compare all 2 →

Technical Details

what runs on :28000

Siemens NX licensing commonly uses FlexNet Publisher: the FlexNet manager (lmgrd) accepts client requests and coordinates with the ugslmd vendor daemon to check license availability and grant checkouts. Port 28000 is a common configured manager port, but the exact port is set by the license-server configuration; the vendor daemon may use a separate fixed or dynamically assigned port. IANA lists both TCP and UDP for nxlmd, but FlexNet licensing traffic normally uses TCP. The protocol is not encrypted by default.

Security Information

exposure of :28000

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 2.6 across 1,951 ports — this one sits 1.4 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Do not expose a license server directly to the internet: reachable clients may be able to query license information or attempt checkouts, and the service can disclose details useful for identifying the installation. Restrict access to trusted client networks and configure the manager and vendor-daemon ports explicitly in firewall rules. IANA records reports of unauthorized use for this assignment, but that does not identify a specific vulnerability or incident.

Record

iana registry entry

port: :28000
service: NX License Manager
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 4/10caution
category: Network Services System
usage: In Siemens NX installations, clients contact the license server to check out floating licenses. The server is based on FlexNet Publisher, commonly using lmgrd and the ugslmd vendor daemon; 28000 is a common manager port, while the vendor daemon may use a separately configured port.
lookups: 0rank 993
added: 2026-10-19
updated: 2026-10-19
references: IANA service name registry — port 28000

Something wrong?

This record is maintained by the engineers who use port 28000. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-19.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :28000NX License Manager

Technical Details

Security Information

Related Ports

Port 28000NX License Manager