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// Other services

Port 684: CORBA IIOP SSL

Port 684 is assigned by IANA to corba-iiop-ssl (CORBA IIOP SSL).

684

How corba-iiop-ssl works

Other services
client:684corba-iiop-sslresponse client:684corba-iiop-sslresponse

The client sends a request to port 684 and the corba-iiop-ssl 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 684 dangerous?

We have no specific security note for port 684. 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 684

ServicePortTransportDescriptionReferenceUpdated
corba-iiop-ssl 684 TCP, UDP CORBA IIOP SSL - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 684, and is it reachable?

Linux

sudo ss -ltnup 'sport = :684'      # process listening on 684
sudo lsof -nP -i :684

macOS

sudo lsof -nP -i :684

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 684 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 684
netstat -ano | findstr :684

From another machine

nmap -p 684 -sV <host>
sudo nmap -sU -p 684 <host>
nc -zv <host> 684

Block it in the firewall

sudo ufw deny 684/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 684" -Direction Inbound -LocalPort 684 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 684 used for?

Port 684 is assigned by IANA to corba-iiop-ssl (CORBA IIOP SSL).

Is port 684 TCP or UDP?

Port 684 is registered for TCP and UDP.

Is it safe to open port 684?

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 684 is open?

On Linux run "ss -ltnup 'sport = :684'", on macOS "lsof -nP -i :684", and on Windows "netstat -ano | findstr :684" to see the local process. From another machine, "nmap -p 684 <host>" shows whether it is reachable.

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