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// Other services

Port 5628: HTrust API

Port 5628 is assigned by IANA to htrust (HTrust API).

5628

How htrust works

Other services
client:5628htrustresponse client:5628htrustresponse

The client sends a request to port 5628 and the htrust 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 5628 dangerous?

We have no specific security note for port 5628. 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 5628

ServicePortTransportDescriptionReferenceUpdated
htrust 5628 TCP, UDP HTrust API - 2008-10-24

// source: IANA service name and port number registry

03 Check it

Which program uses port 5628, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5628'      # process listening on 5628
sudo lsof -nP -i :5628

macOS

sudo lsof -nP -i :5628

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5628 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5628
netstat -ano | findstr :5628

From another machine

nmap -p 5628 -sV <host>
sudo nmap -sU -p 5628 <host>
nc -zv <host> 5628

Block it in the firewall

sudo ufw deny 5628/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5628" -Direction Inbound -LocalPort 5628 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5628 used for?

Port 5628 is assigned by IANA to htrust (HTrust API).

Is port 5628 TCP or UDP?

Port 5628 is registered for TCP and UDP.

Is it safe to open port 5628?

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 5628 is open?

On Linux run "ss -ltnup 'sport = :5628'", on macOS "lsof -nP -i :5628", and on Windows "netstat -ano | findstr :5628" to see the local process. From another machine, "nmap -p 5628 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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