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// Other services

Port 5784: Cisco Interbox Application Redundancy

Port 5784 is assigned by IANA to ibar (Cisco Interbox Application Redundancy).

5784

How ibar works

Other services
client:5784ibarresponse client:5784ibarresponse

The client sends a request to port 5784 and the ibar service answers.

Transport
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 5784 dangerous?

We have no specific security note for port 5784. 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 5784

ServicePortTransportDescriptionReferenceUpdated
ibar 5784 UDP Cisco Interbox Application Redundancy - 2010-02-03
-5784-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5784, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5784'      # process listening on 5784
sudo lsof -nP -i :5784

macOS

sudo lsof -nP -i :5784

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5784 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5784
netstat -ano | findstr :5784

From another machine

nmap -p 5784 -sV <host>
sudo nmap -sU -p 5784 <host>
nc -zv <host> 5784

Block it in the firewall

sudo ufw deny 5784/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5784" -Direction Inbound -LocalPort 5784 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 5784 used for?

Port 5784 is assigned by IANA to ibar (Cisco Interbox Application Redundancy).

Is port 5784 TCP or UDP?

Port 5784 is registered for UDP.

Is it safe to open port 5784?

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 5784 is open?

On Linux run "ss -ltnup 'sport = :5784'", on macOS "lsof -nP -i :5784", and on Windows "netstat -ano | findstr :5784" to see the local process. From another machine, "nmap -p 5784 <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

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