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Network Security Enhancement – Blocking of Specific Network Ports from the Internet

23 December 2025

As part of the University’s ongoing initiative to enhance network security and reduce our exposure to external threats, direct access from Internet to specific network ports on campus networks will be blocked starting from 6 Jan 2026. If you need to access these services from off campus, please connect to the VPN first.

Category	Service	Port(s)
Database	MySQL	TCP 3306
	PostgreSQL	TCP 5432
Authentication	Kerberos	TCP/UDP 88
	RPC (Portmapper)	TCP/UDP 111
Service Discovery	mDNS	UDP 5353
	WSDD	TCP/UDP 3702
Management Services	VMware ESXi	TCP/UDP 902
	IPMI	TCP/UDP 623
Remote Access	X Window	TCP 6000
	VNC	TCP 5900–5901
Legacy Service	FTP	TCP 21

We recommend replacing FTP with SFTP for secure file transfers.

HKUST ITSO AI Chatbot

Network Security Enhancement – Blocking of Specific Network Ports from the Internet

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