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// Web

Port 4590: RID over HTTP/TLS

Port 4590 is assigned by IANA to rid (RID over HTTP/TLS).

4590

How rid works

Web
browser:4590rid browser:4590rid

A browser sends an HTTP request to port 4590 and the rid server sends the page back.

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
Web
01 Security

Is port 4590 dangerous?

We have no specific security note for port 4590. Its risk depends on the program actually listening on it. General advice for web services:

  • Serve it over HTTPS only and check the HTTP security headers.
  • Keep admin consoles and development servers off the Internet.
  • Patch the application server and remove default credentials and sample apps.
02 Registry

IANA registry entries for port 4590

ServicePortTransportDescriptionReferenceUpdated
rid 4590 TCP RID over HTTP/TLS RFC 6546 -
-4590-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4590, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4590'      # process listening on 4590
sudo lsof -nP -i :4590

macOS

sudo lsof -nP -i :4590

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4590 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4590
netstat -ano | findstr :4590

From another machine

nmap -p 4590 -sV <host>
nc -zv <host> 4590

Block it in the firewall

sudo ufw deny 4590/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4590" -Direction Inbound -LocalPort 4590 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4590 used for?

Port 4590 is assigned by IANA to rid (RID over HTTP/TLS).

Is port 4590 TCP or UDP?

Port 4590 is registered for TCP.

Is it safe to open port 4590?

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. Serve it over HTTPS only and check the HTTP security headers.

How do I check if port 4590 is open?

On Linux run "ss -ltnup 'sport = :4590'", on macOS "lsof -nP -i :4590", and on Windows "netstat -ano | findstr :4590" to see the local process. From another machine, "nmap -p 4590 <host>" shows whether it is reachable.

05 Related
:443 HTTPS tcp · udp · sctp · low risk :80 HTTP tcp · udp · sctp · moderate risk :8080 HTTP alternate tcp · udp · high risk :8443 HTTPS alternate tcp · udp · moderate risk :3000 Dev servers / Grafana tcp · udp · moderate risk :5000 Flask / Docker registry / UPnP tcp · udp · moderate risk :8000 HTTP alternate (dev) tcp · udp · moderate risk :8888 Jupyter / HTTP alternate tcp · udp · high risk

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