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// Directory & authentication

Port 5059: SIP Directory Services

Port 5059 is assigned by IANA to sds (SIP Directory Services).

5059

How sds works

Directory & authentication
userdirectorysdsresponse userdirectorysdsresponse

The client proves who it is on port 5059 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 5059 dangerous?

We have no specific security note for port 5059. 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 5059

ServicePortTransportDescriptionReferenceUpdated
sds 5059 TCP, UDP SIP Directory Services - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 5059, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5059'      # process listening on 5059
sudo lsof -nP -i :5059

macOS

sudo lsof -nP -i :5059

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5059 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5059
netstat -ano | findstr :5059

From another machine

nmap -p 5059 -sV <host>
sudo nmap -sU -p 5059 <host>
nc -zv <host> 5059

Block it in the firewall

sudo ufw deny 5059/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5059" -Direction Inbound -LocalPort 5059 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5059 used for?

Port 5059 is assigned by IANA to sds (SIP Directory Services).

Is port 5059 TCP or UDP?

Port 5059 is registered for TCP and UDP.

Is it safe to open port 5059?

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 5059 is open?

On Linux run "ss -ltnup 'sport = :5059'", on macOS "lsof -nP -i :5059", and on Windows "netstat -ano | findstr :5059" to see the local process. From another machine, "nmap -p 5059 <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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