- 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.
Port 5784: Cisco Interbox Application Redundancy
Port 5784 is assigned by IANA to ibar (Cisco Interbox Application Redundancy).
5784
How ibar works
Other servicesThe 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
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:
IANA registry entries for port 5784
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| ibar | 5784 | UDP | Cisco Interbox Application Redundancy | - | 2010-02-03 |
| - | 5784 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 5784, and is it reachable?
Linux
sudo ss -ltnup 'sport = :5784' # process listening on 5784
sudo lsof -nP -i :5784macOS
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
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.
Other other services ports
: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