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// Other services

Port 5033: Janstor Secure Data

Port 5033 is assigned by IANA to jtnetd-server (Janstor Secure Data).

5033

How jtnetd-server works

Other services
client:5033jtnetd-serverresponse client:5033jtnetd-serverresponse

The client sends a request to port 5033 and the jtnetd-server service answers.

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
Other services
01 Security

Is port 5033 dangerous?

We have no specific security note for port 5033. 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 5033

ServicePortTransportDescriptionReferenceUpdated
jtnetd-server 5033 TCP Janstor Secure Data - 2015-06-08
-5033-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5033, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5033'      # process listening on 5033
sudo lsof -nP -i :5033

macOS

sudo lsof -nP -i :5033

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5033 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5033
netstat -ano | findstr :5033

From another machine

nmap -p 5033 -sV <host>
nc -zv <host> 5033

Block it in the firewall

sudo ufw deny 5033/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5033" -Direction Inbound -LocalPort 5033 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5033 used for?

Port 5033 is assigned by IANA to jtnetd-server (Janstor Secure Data).

Is port 5033 TCP or UDP?

Port 5033 is registered for TCP.

Is it safe to open port 5033?

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 5033 is open?

On Linux run "ss -ltnup 'sport = :5033'", on macOS "lsof -nP -i :5033", and on Windows "netstat -ano | findstr :5033" to see the local process. From another machine, "nmap -p 5033 <host>" shows whether it is reachable.

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