- 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 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 servicesThe 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
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:
IANA registry entries for port 6704
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| frc-hp | 6704 | SCTP | ForCES HP (High Priority) channel | RFC 5811 | - |
| - | 6704 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 6704, and is it reachable?
Linux
sudo ss -ltnup 'sport = :6704' # process listening on 6704
sudo lsof -nP -i :6704macOS
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
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.
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