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Port 7903 (tnos-dps)

IANA assigns port 7903 to tnos-dps: TNOS Secure DiaguardProtocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tnos-dps TCP TNOS Secure DiaguardProtocol Rene Kurt -
tnos-dps UDP TNOS Secure DiaguardProtocol Rene Kurt -

Registry dates for this port: registered 2005-08.

Check what is listening on port 7903

Linux: is anything listening on TCP 7903?
sudo ss -tlnp 'sport = :7903'
Linux: UDP 7903
sudo ss -ulnp 'sport = :7903'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7903
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7903 '
Windows (Command Prompt)
netstat -ano | findstr :7903
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7903 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7903
From Windows
Test-NetConnection HOST -Port 7903
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7903

Block port 7903 in the firewall

ufw
sudo ufw deny 7903/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7903 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7903 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7903' -Direction Inbound -Protocol TCP -LocalPort 7903 -Action Block
ufw
sudo ufw deny 7903/udp
iptables
sudo iptables -A INPUT -p udp --dport 7903 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7903 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7903' -Direction Inbound -Protocol UDP -LocalPort 7903 -Action Block

Related ports

7901tnos-sp7902tnos-dp7913qo-secure7932t2-drm

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