Port 7123
snif · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | snif |
| Reference | draft-zubov-snif-05, Section 4.3, draft-zubov-snif-05, Section 4.4 |
| Registered | 2021-12-24 |
| Modified | 2026-07-22 |
Frequently asked questions
What is port 7123 used for?
Port 7123 is registered with the IANA for snif (TCP/UDP). Description: SNIF End-to-End TLS Relay Control Connection; SNIF End-to-End TLS Relay over QUIC.
Is port 7123 a well-known port?
No. Port 7123 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 7123 is open?
Locally on Linux with ss -tulpn | grep ':7123\b', on Windows with netstat -ano | findstr :7123. To test a remote host use Test-NetConnection <host> -Port 7123 in PowerShell or nc -zv <host> 7123 on Linux/macOS.
How do I open port 7123 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 7123/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=7123/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 7123" -Direction Inbound -Protocol TCP -LocalPort 7123 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | snif | SNIF End-to-End TLS Relay Control Connection |
| UDP | snif | SNIF End-to-End TLS Relay over QUIC |