When a Windows Server hosts services for users or other systems, port visibility is one of the first and most essential things an administrator must master; knowing which ports are listening, which are established, and which are blocked by a firewall directly affects uptime, security posture...
administration
firewall
get-nettcpconnection
http.sys
netstat
network diagnostics
port management
port scanning
port visibility
powershell
remote testing
resource monitor
security best practices
tcpview
test-netconnection
troubleshooting
urlacl
windows server