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// Other services

Port 3962: SBI Agent Protocol

Port 3962 is assigned by IANA to sbi-agent (SBI Agent Protocol).

3962

How sbi-agent works

Other services
client:3962sbi-agentresponse client:3962sbi-agentresponse

The client sends a request to port 3962 and the sbi-agent 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 3962 dangerous?

We have no specific security note for port 3962. 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 3962

ServicePortTransportDescriptionReferenceUpdated
sbi-agent 3962 TCP, UDP SBI Agent Protocol - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 3962, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3962'      # process listening on 3962
sudo lsof -nP -i :3962

macOS

sudo lsof -nP -i :3962

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3962 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3962
netstat -ano | findstr :3962

From another machine

nmap -p 3962 -sV <host>
sudo nmap -sU -p 3962 <host>
nc -zv <host> 3962

Block it in the firewall

sudo ufw deny 3962/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3962" -Direction Inbound -LocalPort 3962 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3962 used for?

Port 3962 is assigned by IANA to sbi-agent (SBI Agent Protocol).

Is port 3962 TCP or UDP?

Port 3962 is registered for TCP and UDP.

Is it safe to open port 3962?

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 3962 is open?

On Linux run "ss -ltnup 'sport = :3962'", on macOS "lsof -nP -i :3962", and on Windows "netstat -ano | findstr :3962" to see the local process. From another machine, "nmap -p 3962 <host>" shows whether it is reachable.

05 Related
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