[DS] Recommended for closing ports caused by security reasons

A list of ports required to be completely closed or restricted to only certain hosts:

Windows:
135 - Microsoft RPC

137 - 139 - Windows NetBIOS

161 - 162 - SNMP

445 - File Sharing

1433 - 1434 - Microsoft SQL Server 3389 - Microsoft RDP

Linux:
21 - FTP

22 - SSH

23 - Telnet

25 - SMTP

110 - POP3

161 - 162 - SNMP

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