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Port 4672 (rfa)

IANA assigns port 4672 to rfa: remote file access server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rfa TCP remote file access server - -
rfa UDP remote file access server - -

Check what is listening on port 4672

Linux: is anything listening on TCP 4672?
sudo ss -tlnp 'sport = :4672'
Linux: UDP 4672
sudo ss -ulnp 'sport = :4672'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4672
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4672 '
Windows (Command Prompt)
netstat -ano | findstr :4672
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4672 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4672
From Windows
Test-NetConnection HOST -Port 4672
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4672

Block port 4672 in the firewall

ufw
sudo ufw deny 4672/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4672 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4672 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4672' -Direction Inbound -Protocol TCP -LocalPort 4672 -Action Block
ufw
sudo ufw deny 4672/udp
iptables
sudo iptables -A INPUT -p udp --dport 4672 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4672 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4672' -Direction Inbound -Protocol UDP -LocalPort 4672 -Action Block

Related ports

4670light4671acter4673cxws4674appiq-mgmt

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.