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// DevOps, cloud & containers

Port 8433: Non Persistent Desktop and Application Streaming

Port 8433 is assigned by IANA to aws-as2 (Non Persistent Desktop and Application Streaming).

8433

How aws-as2 works

DevOps, cloud & containers
adminhostaws-as2 adminhostaws-as2

Commands sent to port 8433 create and control containers or cluster resources on the host.

Transport
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
DevOps, cloud & containers
01 Security

Is port 8433 dangerous?

We have no specific security note for port 8433. Its risk depends on the program actually listening on it. General advice for devops, cloud & containers services:

  • Container and orchestration APIs give full control of hosts: require mutual TLS and RBAC.
  • Never expose them to the Internet.
  • Rotate tokens and certificates and audit who has access.
02 Registry

IANA registry entries for port 8433

ServicePortTransportDescriptionReferenceUpdated
aws-as2 8433 UDP Non Persistent Desktop and Application Streaming - 2022-11-07
-8433-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8433, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8433'      # process listening on 8433
sudo lsof -nP -i :8433

macOS

sudo lsof -nP -i :8433

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8433 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8433
netstat -ano | findstr :8433

From another machine

nmap -p 8433 -sV <host>
sudo nmap -sU -p 8433 <host>
nc -zv <host> 8433

Block it in the firewall

sudo ufw deny 8433/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8433" -Direction Inbound -LocalPort 8433 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 8433 used for?

Port 8433 is assigned by IANA to aws-as2 (Non Persistent Desktop and Application Streaming).

Is port 8433 TCP or UDP?

Port 8433 is registered for UDP.

Is it safe to open port 8433?

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. Container and orchestration APIs give full control of hosts: require mutual TLS and RBAC.

How do I check if port 8433 is open?

On Linux run "ss -ltnup 'sport = :8433'", on macOS "lsof -nP -i :8433", and on Windows "netstat -ano | findstr :8433" to see the local process. From another machine, "nmap -p 8433 <host>" shows whether it is reachable.

05 Related
:2375 Docker API (HTTP) tcp · critical risk :2376 Docker API (TLS) tcp · high risk :6443 Kubernetes API tcp · udp · high risk :10250 Kubelet API tcp · critical risk :2379 etcd tcp · critical risk :8500 Consul tcp · udp · high risk :4505 SaltStack tcp · critical risk :9000 PHP-FPM / SonarQube / Portainer tcp · udp · high risk

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