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Port 3799 (radius-dynauth)

IANA assigns port 3799 to radius-dynauth: RADIUS Dynamic Authorization.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
radius-dynauth TCP RADIUS Dynamic Authorization - RFC 3576
radius-dynauth UDP RADIUS Dynamic Authorization - RFC 3576

Check what is listening on port 3799

Linux: is anything listening on TCP 3799?
sudo ss -tlnp 'sport = :3799'
Linux: UDP 3799
sudo ss -ulnp 'sport = :3799'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3799
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3799 '
Windows (Command Prompt)
netstat -ano | findstr :3799
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3799 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3799
From Windows
Test-NetConnection HOST -Port 3799
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3799

Block port 3799 in the firewall

ufw
sudo ufw deny 3799/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3799 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3799 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3799' -Direction Inbound -Protocol TCP -LocalPort 3799 -Action Block
ufw
sudo ufw deny 3799/udp
iptables
sudo iptables -A INPUT -p udp --dport 3799 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3799 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3799' -Direction Inbound -Protocol UDP -LocalPort 3799 -Action Block

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