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// Other services

Port 5099: SentLM Srv2Srv

Port 5099 is assigned by IANA to sentlm-srv2srv (SentLM Srv2Srv).

5099

How sentlm-srv2srv works

Other services
client:5099sentlm-srv2srvresponse client:5099sentlm-srv2srvresponse

The client sends a request to port 5099 and the sentlm-srv2srv 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 5099 dangerous?

We have no specific security note for port 5099. 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 5099

ServicePortTransportDescriptionReferenceUpdated
sentlm-srv2srv 5099 TCP, UDP SentLM Srv2Srv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5099, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5099'      # process listening on 5099
sudo lsof -nP -i :5099

macOS

sudo lsof -nP -i :5099

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5099 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5099
netstat -ano | findstr :5099

From another machine

nmap -p 5099 -sV <host>
sudo nmap -sU -p 5099 <host>
nc -zv <host> 5099

Block it in the firewall

sudo ufw deny 5099/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5099" -Direction Inbound -LocalPort 5099 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5099 used for?

Port 5099 is assigned by IANA to sentlm-srv2srv (SentLM Srv2Srv).

Is port 5099 TCP or UDP?

Port 5099 is registered for TCP and UDP.

Is it safe to open port 5099?

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 5099 is open?

On Linux run "ss -ltnup 'sport = :5099'", on macOS "lsof -nP -i :5099", and on Windows "netstat -ano | findstr :5099" to see the local process. From another machine, "nmap -p 5099 <host>" shows whether it is reachable.

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