By default, which port is used to connect to the GAiA Portal?

The GAiA Portal is the WebUI for Check Point security appliances. By default, it uses the HTTPS protocol for secure communication. The default port for HTTPS-based web access is port 443.

Port 4434 (A) is not the default port for GAiA Portal.

Port 80 (B) is the default for standard HTTP, but GAiA Portal requires HTTPS.

Port 8080 (C) is sometimes used for alternative web services, but not for GAiA Portal.

Port 443 (D) is the correct default port for GAiA Portal access.

Thus, the correct answer is D. 443.