- Keep directory and authentication services on internal networks.
- Require signing or TLS and disable anonymous queries.
- Monitor authentication failures for spraying and brute force.
Port 5059: SIP Directory Services
Port 5059 is assigned by IANA to sds (SIP Directory Services).
5059
How sds works
Directory & authenticationThe 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
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:
IANA registry entries for port 5059
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| sds | 5059 | TCP, UDP | SIP Directory Services | - | 2006-03 |
// source: IANA service name and port number registry
Which program uses port 5059, and is it reachable?
Linux
sudo ss -ltnup 'sport = :5059' # process listening on 5059
sudo lsof -nP -i :5059macOS
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
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.
Other directory & authentication ports
: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