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// Other services

Port 2102: Zephyr server

Port 2102 is assigned by IANA to zephyr-srv (Zephyr server).

2102

How zephyr-srv works

Other services
client:2102zephyr-srvresponse client:2102zephyr-srvresponse

The client sends a request to port 2102 and the zephyr-srv 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 2102 dangerous?

We have no specific security note for port 2102. 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 2102

ServicePortTransportDescriptionReferenceUpdated
zephyr-srv 2102 TCP, UDP Zephyr server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2102, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2102'      # process listening on 2102
sudo lsof -nP -i :2102

macOS

sudo lsof -nP -i :2102

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2102 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2102
netstat -ano | findstr :2102

From another machine

nmap -p 2102 -sV <host>
sudo nmap -sU -p 2102 <host>
nc -zv <host> 2102

Block it in the firewall

sudo ufw deny 2102/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2102" -Direction Inbound -LocalPort 2102 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2102 used for?

Port 2102 is assigned by IANA to zephyr-srv (Zephyr server).

Is port 2102 TCP or UDP?

Port 2102 is registered for TCP and UDP.

Is it safe to open port 2102?

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 2102 is open?

On Linux run "ss -ltnup 'sport = :2102'", on macOS "lsof -nP -i :2102", and on Windows "netstat -ano | findstr :2102" to see the local process. From another machine, "nmap -p 2102 <host>" shows whether it is reachable.

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