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// Other services

Port 4546: SF License Manager (Sentinel)

Port 4546 is assigned by IANA to sf-lm (SF License Manager (Sentinel)).

4546

How sf-lm works

Other services
client:4546sf-lmresponse client:4546sf-lmresponse

The client sends a request to port 4546 and the sf-lm service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 4546 dangerous?

We have no specific security note for port 4546. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 4546

ServicePortTransportDescriptionReferenceUpdated
sf-lm 4546 TCP, UDP SF License Manager (Sentinel) - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4546, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4546'      # process listening on 4546
sudo lsof -nP -i :4546

macOS

sudo lsof -nP -i :4546

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4546 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4546
netstat -ano | findstr :4546

From another machine

nmap -p 4546 -sV <host>
sudo nmap -sU -p 4546 <host>
nc -zv <host> 4546

Block it in the firewall

sudo ufw deny 4546/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4546" -Direction Inbound -LocalPort 4546 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4546 used for?

Port 4546 is assigned by IANA to sf-lm (SF License Manager (Sentinel)).

Is port 4546 TCP or UDP?

Port 4546 is registered for TCP and UDP.

Is it safe to open port 4546?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 4546 is open?

On Linux run "ss -ltnup 'sport = :4546'", on macOS "lsof -nP -i :4546", and on Windows "netstat -ano | findstr :4546" to see the local process. From another machine, "nmap -p 4546 <host>" shows whether it is reachable.

05 Related
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