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Port 9402 (sec-pc2fax-srv)

IANA assigns port 9402 to sec-pc2fax-srv: Samsung PC2FAX for Network Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sec-pc2fax-srv TCP Samsung PC2FAX for Network Server HyeongBae Yu -
sec-pc2fax-srv UDP Samsung PC2FAX for Network Server HyeongBae Yu -

Registry dates for this port: registered 2008-07-31.

Check what is listening on port 9402

Linux: is anything listening on TCP 9402?
sudo ss -tlnp 'sport = :9402'
Linux: UDP 9402
sudo ss -ulnp 'sport = :9402'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9402
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9402 '
Windows (Command Prompt)
netstat -ano | findstr :9402
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9402 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9402
From Windows
Test-NetConnection HOST -Port 9402
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9402

Block port 9402 in the firewall

ufw
sudo ufw deny 9402/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9402 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9402 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9402' -Direction Inbound -Protocol TCP -LocalPort 9402 -Action Block
ufw
sudo ufw deny 9402/udp
iptables
sudo iptables -A INPUT -p udp --dport 9402 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9402 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9402' -Direction Inbound -Protocol UDP -LocalPort 9402 -Action Block

Related ports

9400sec-t4net-srv9401sec-t4net-clt9418Git protocol9443HTTPS alternate / Portainer

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