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Port 7799 (altbsdp)

IANA assigns port 7799 to altbsdp: Alternate BSDP Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
altbsdp TCP Alternate BSDP Service Dieter Siegmund -
altbsdp UDP Alternate BSDP Service Dieter Siegmund -

Registry dates for this port: registered 2007-10-22.

Check what is listening on port 7799

Linux: is anything listening on TCP 7799?
sudo ss -tlnp 'sport = :7799'
Linux: UDP 7799
sudo ss -ulnp 'sport = :7799'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7799
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7799 '
Windows (Command Prompt)
netstat -ano | findstr :7799
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7799 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7799
From Windows
Test-NetConnection HOST -Port 7799
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7799

Block port 7799 in the firewall

ufw
sudo ufw deny 7799/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7799 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7799 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7799' -Direction Inbound -Protocol TCP -LocalPort 7799 -Action Block
ufw
sudo ufw deny 7799/udp
iptables
sudo iptables -A INPUT -p udp --dport 7799 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7799 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7799' -Direction Inbound -Protocol UDP -LocalPort 7799 -Action Block

Related ports

7797pnet-conn7798pnet-enc7800asr7801ssp-client

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