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Port 4307 (trueconf)

IANA assigns port 4307 to trueconf: TrueConf Videoconference Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
trueconf TCP TrueConf Videoconference Service Dmitry Odintsov -
trueconf UDP TrueConf Videoconference Service Dmitry Odintsov -

Registry dates for this port: registered 2007-10-22, last modified 2017-05-12.

Check what is listening on port 4307

Linux: is anything listening on TCP 4307?
sudo ss -tlnp 'sport = :4307'
Linux: UDP 4307
sudo ss -ulnp 'sport = :4307'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4307
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4307 '
Windows (Command Prompt)
netstat -ano | findstr :4307
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4307 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4307
From Windows
Test-NetConnection HOST -Port 4307
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4307

Block port 4307 in the firewall

ufw
sudo ufw deny 4307/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4307 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4307 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4307' -Direction Inbound -Protocol TCP -LocalPort 4307 -Action Block
ufw
sudo ufw deny 4307/udp
iptables
sudo iptables -A INPUT -p udp --dport 4307 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4307 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4307' -Direction Inbound -Protocol UDP -LocalPort 4307 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.