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// Other services

Port 7799: Alternate BSDP Service

Port 7799 is assigned by IANA to altbsdp (Alternate BSDP Service).

7799

How altbsdp works

Other services
client:7799altbsdpresponse client:7799altbsdpresponse

The client sends a request to port 7799 and the altbsdp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 7799 dangerous?

We have no specific security note for port 7799. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 7799

ServicePortTransportDescriptionReferenceUpdated
altbsdp 7799 TCP, UDP Alternate BSDP Service - 2007-10-22

// source: IANA service name and port number registry

03 Check it

Which program uses port 7799, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7799'      # process listening on 7799
sudo lsof -nP -i :7799

macOS

sudo lsof -nP -i :7799

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7799 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7799
netstat -ano | findstr :7799

From another machine

nmap -p 7799 -sV <host>
sudo nmap -sU -p 7799 <host>
nc -zv <host> 7799

Block it in the firewall

sudo ufw deny 7799/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7799" -Direction Inbound -LocalPort 7799 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7799 used for?

Port 7799 is assigned by IANA to altbsdp (Alternate BSDP Service).

Is port 7799 TCP or UDP?

Port 7799 is registered for TCP and UDP.

Is it safe to open port 7799?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 7799 is open?

On Linux run "ss -ltnup 'sport = :7799'", on macOS "lsof -nP -i :7799", and on Windows "netstat -ano | findstr :7799" to see the local process. From another machine, "nmap -p 7799 <host>" shows whether it is reachable.

05 Related
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