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// Directory & authentication

Port 3411: BioLink Authenteon server

Port 3411 is assigned by IANA to biolink-auth (BioLink Authenteon server).

3411

How biolink-auth works

Directory & authentication
userdirectorybiolink-authresponse userdirectorybiolink-authresponse

The client proves who it is on port 3411 and gets an answer (or a ticket) it can use with other services.

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
Directory & authentication
01 Security

Is port 3411 dangerous?

We have no specific security note for port 3411. Its risk depends on the program actually listening on it. General advice for directory & authentication services:

  • Keep directory and authentication services on internal networks.
  • Require signing or TLS and disable anonymous queries.
  • Monitor authentication failures for spraying and brute force.
02 Registry

IANA registry entries for port 3411

ServicePortTransportDescriptionReferenceUpdated
biolink-auth 3411 TCP, UDP BioLink Authenteon server - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3411, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3411'      # process listening on 3411
sudo lsof -nP -i :3411

macOS

sudo lsof -nP -i :3411

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3411 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3411
netstat -ano | findstr :3411

From another machine

nmap -p 3411 -sV <host>
sudo nmap -sU -p 3411 <host>
nc -zv <host> 3411

Block it in the firewall

sudo ufw deny 3411/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3411" -Direction Inbound -LocalPort 3411 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3411 used for?

Port 3411 is assigned by IANA to biolink-auth (BioLink Authenteon server).

Is port 3411 TCP or UDP?

Port 3411 is registered for TCP and UDP.

Is it safe to open port 3411?

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. Keep directory and authentication services on internal networks.

How do I check if port 3411 is open?

On Linux run "ss -ltnup 'sport = :3411'", on macOS "lsof -nP -i :3411", and on Windows "netstat -ano | findstr :3411" to see the local process. From another machine, "nmap -p 3411 <host>" shows whether it is reachable.

05 Related
:389 LDAP tcp · udp · high risk :636 LDAPS tcp · udp · moderate risk :88 Kerberos tcp · udp · high risk :3268 Global Catalog (LDAP) tcp · udp · high risk :1812 RADIUS udp · tcp · moderate risk :31 MSG Authentication tcp · udp :49 Login Host Protocol (TACACS) tcp · udp :56 XNS Authentication tcp · udp

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