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Port 7123 (snif)

IANA assigns port 7123 to snif: SNIF End-to-End TLS Relay Control Connection.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
snif TCP SNIF End-to-End TLS Relay Control Connection VESvault Corp draft-zubov-snif-05, Section 4.3
snif UDP SNIF End-to-End TLS Relay over QUIC VESvault Corp draft-zubov-snif-05, Section 4.4

Registry dates for this port: registered 2021-12-24, last modified 2026-07-22.

Check what is listening on port 7123

Linux: is anything listening on TCP 7123?
sudo ss -tlnp 'sport = :7123'
Linux: UDP 7123
sudo ss -ulnp 'sport = :7123'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7123
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7123 '
Windows (Command Prompt)
netstat -ano | findstr :7123
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7123 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7123
From Windows
Test-NetConnection HOST -Port 7123
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7123

Block port 7123 in the firewall

ufw
sudo ufw deny 7123/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7123 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7123 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7123' -Direction Inbound -Protocol TCP -LocalPort 7123 -Action Block
ufw
sudo ufw deny 7123/udp
iptables
sudo iptables -A INPUT -p udp --dport 7123 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7123 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7123' -Direction Inbound -Protocol UDP -LocalPort 7123 -Action Block

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