Curated port reference

Port 3389: RDP

RDP commonly uses port 3389 over TCP + UDP. Review its purpose, traffic direction and operational security considerations.

3389TCP + UDP

RDP

Microsoft Remote Desktop interactive sessions; modern clients can use both TCP and UDP.

Typical use

Remote Windows administration, virtual desktops and published applications.

Traffic direction

Client to server

Security considerations

Do not expose directly to the internet. Use a gateway or VPN, Network Level Authentication, MFA and source restrictions.

Remote Desktop ProtocolWindows Server