- 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 13832: Certificate Management and Issuing
Port 13832 is assigned by IANA to a-trust-rpc (Certificate Management and Issuing).
13832
How a-trust-rpc works
Directory & authenticationThe client proves who it is on port 13832 and gets an answer (or a ticket) it can use with other services.
- Transport
- TCP
- 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 13832 dangerous?
We have no specific security note for port 13832. Its risk depends on the program actually listening on it. General advice for directory & authentication services:
IANA registry entries for port 13832
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| a-trust-rpc | 13832 | TCP | Certificate Management and Issuing | - | 2023-06-05 |
| - | 13832 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 13832, and is it reachable?
Linux
sudo ss -ltnup 'sport = :13832' # process listening on 13832
sudo lsof -nP -i :13832macOS
sudo lsof -nP -i :13832
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 13832 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 13832 netstat -ano | findstr :13832
From another machine
nmap -p 13832 -sV <host> nc -zv <host> 13832
Block it in the firewall
sudo ufw deny 13832/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 13832" -Direction Inbound -LocalPort 13832 -Protocol TCP -Action Block # Windows
What is port 13832 used for?
Port 13832 is assigned by IANA to a-trust-rpc (Certificate Management and Issuing).
Is port 13832 TCP or UDP?
Port 13832 is registered for TCP.
Is it safe to open port 13832?
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 13832 is open?
On Linux run "ss -ltnup 'sport = :13832'", on macOS "lsof -nP -i :13832", and on Windows "netstat -ano | findstr :13832" to see the local process. From another machine, "nmap -p 13832 <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