Port 443 is used for HTTPS, which is a secure version of HTTP that encrypts the data between the web server and the client. Port 3389 is used for RDP, which is a protocol that allows remote desktop connections to a server. These ports should be allowed for a secure web server that can be administered via RDP.
[References:, CompTIAServer+ Certification Exam Objectives1, page 15, Common Ports Cheat Sheet: The Ultimate Ports & Protocols List2, , , ]
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