CyberHunter
Local dataset, no network
// Other services

Port 2390: RSMTP

Port 2390 is assigned by IANA to rsmtp (RSMTP).

2390

How rsmtp works

Other services
client:2390rsmtpresponse client:2390rsmtpresponse

The client sends a request to port 2390 and the rsmtp 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 2390 dangerous?

We have no specific security note for port 2390. 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 2390

ServicePortTransportDescriptionReferenceUpdated
rsmtp 2390 TCP, UDP RSMTP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2390, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2390'      # process listening on 2390
sudo lsof -nP -i :2390

macOS

sudo lsof -nP -i :2390

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2390 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2390
netstat -ano | findstr :2390

From another machine

nmap -p 2390 -sV <host>
sudo nmap -sU -p 2390 <host>
nc -zv <host> 2390

Block it in the firewall

sudo ufw deny 2390/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2390" -Direction Inbound -LocalPort 2390 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2390 used for?

Port 2390 is assigned by IANA to rsmtp (RSMTP).

Is port 2390 TCP or UDP?

Port 2390 is registered for TCP and UDP.

Is it safe to open port 2390?

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 2390 is open?

On Linux run "ss -ltnup 'sport = :2390'", on macOS "lsof -nP -i :2390", and on Windows "netstat -ano | findstr :2390" to see the local process. From another machine, "nmap -p 2390 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news