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// Other services

Port 5678: Remote Replication Agent Connection

Port 5678 is assigned by IANA to rrac (Remote Replication Agent Connection).

5678

How rrac works

Other services
client:5678rracresponse client:5678rracresponse

The client sends a request to port 5678 and the rrac 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 5678 dangerous?

We have no specific security note for port 5678. 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 5678

ServicePortTransportDescriptionReferenceUpdated
rrac 5678 TCP, UDP Remote Replication Agent Connection - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5678, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5678'      # process listening on 5678
sudo lsof -nP -i :5678

macOS

sudo lsof -nP -i :5678

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5678 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5678
netstat -ano | findstr :5678

From another machine

nmap -p 5678 -sV <host>
sudo nmap -sU -p 5678 <host>
nc -zv <host> 5678

Block it in the firewall

sudo ufw deny 5678/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5678" -Direction Inbound -LocalPort 5678 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5678 used for?

Port 5678 is assigned by IANA to rrac (Remote Replication Agent Connection).

Is port 5678 TCP or UDP?

Port 5678 is registered for TCP and UDP.

Is it safe to open port 5678?

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 5678 is open?

On Linux run "ss -ltnup 'sport = :5678'", on macOS "lsof -nP -i :5678", and on Windows "netstat -ano | findstr :5678" to see the local process. From another machine, "nmap -p 5678 <host>" shows whether it is reachable.

05 Related
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