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// Other services

Port 6704: ForCES HP (High Priority) channel

Port 6704 is assigned by IANA to frc-hp (ForCES HP (High Priority) channel).

6704

How frc-hp works

Other services
client:6704frc-hpresponse client:6704frc-hpresponse

The client sends a request to port 6704 and the frc-hp service answers.

Transport
SCTP
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 6704 dangerous?

We have no specific security note for port 6704. 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 6704

ServicePortTransportDescriptionReferenceUpdated
frc-hp 6704 SCTP ForCES HP (High Priority) channel RFC 5811 -
-6704-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6704, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6704'      # process listening on 6704
sudo lsof -nP -i :6704

macOS

sudo lsof -nP -i :6704

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6704 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6704
netstat -ano | findstr :6704

From another machine

nmap -p 6704 -sV <host>
nc -zv <host> 6704

Block it in the firewall

sudo ufw deny 6704/sctp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6704" -Direction Inbound -LocalPort 6704 -Protocol SCTP -Action Block  # Windows
04 FAQ
What is port 6704 used for?

Port 6704 is assigned by IANA to frc-hp (ForCES HP (High Priority) channel).

Is port 6704 TCP or UDP?

Port 6704 is registered for SCTP.

Is it safe to open port 6704?

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 6704 is open?

On Linux run "ss -ltnup 'sport = :6704'", on macOS "lsof -nP -i :6704", and on Windows "netstat -ano | findstr :6704" to see the local process. From another machine, "nmap -p 6704 <host>" shows whether it is reachable.

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