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// Other services

Port 2903: SUITCASE

Port 2903 is assigned by IANA to suitcase (SUITCASE).

2903

How suitcase works

Other services
client:2903suitcaseresponse client:2903suitcaseresponse

The client sends a request to port 2903 and the suitcase 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 2903 dangerous?

We have no specific security note for port 2903. 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 2903

ServicePortTransportDescriptionReferenceUpdated
suitcase 2903 TCP, UDP SUITCASE - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2903, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2903'      # process listening on 2903
sudo lsof -nP -i :2903

macOS

sudo lsof -nP -i :2903

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2903 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2903
netstat -ano | findstr :2903

From another machine

nmap -p 2903 -sV <host>
sudo nmap -sU -p 2903 <host>
nc -zv <host> 2903

Block it in the firewall

sudo ufw deny 2903/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2903" -Direction Inbound -LocalPort 2903 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2903 used for?

Port 2903 is assigned by IANA to suitcase (SUITCASE).

Is port 2903 TCP or UDP?

Port 2903 is registered for TCP and UDP.

Is it safe to open port 2903?

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 2903 is open?

On Linux run "ss -ltnup 'sport = :2903'", on macOS "lsof -nP -i :2903", and on Windows "netstat -ano | findstr :2903" to see the local process. From another machine, "nmap -p 2903 <host>" shows whether it is reachable.

05 Related
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