Your company has a main office and a branch office. The two offices are connected by using a WAN link. Each office contains a firewall that filters…

Windows Admin Center (WAC) is a web-based management portal. When installed in gateway mode on a Windows Server operating system, the default configuration uses TCP port 443 for HTTPS communication. Administrators connect to the WAC gateway using a web browser from their workstations. In this scenario, administrators in the main office need to access the WAC gateway in the branch office. Therefore, the branch office firewall must be configured to allow inbound traffic on the port the WAC gateway is listening on, which, by default on Windows Server, is TCP port 443.

B. 3389: This port is used for Remote Desktop Protocol (RDP) connections, not for accessing the main Windows Admin Center web interface.

C. 5985: This is the default port for Windows Remote Management (WinRM) over HTTP, which WAC uses to communicate with managed servers, not for the initial browser-to-gateway connection.

D. 6516: This is the default port used when Windows Admin Center is installed on a Windows client OS (like Windows 10/11), not on a Windows Server.

1. Microsoft Learn

Install Windows Admin Center. Under the "Installation type" section

it states: "When you install Windows Admin Center on Windows Server

it uses port 443 by default... When you install Windows Admin Center on Windows 10

it uses port 6516 by default." This directly confirms that for a server installation

443 is the default.

2. Microsoft Learn

Windows Admin Center frequently asked questions (FAQ). In the "General" section

the question "Which port does Windows Admin Center use?" is answered with: "Windows Admin Center gateway uses port 443 by default on Windows Server

but you can specify a different port during installation." This corroborates the default port for the scenario.

3. Microsoft Learn

Planning for Windows Admin Center. The "Gateway" section describes the architecture: "The Windows Admin Center gateway... lets you connect to and manage your servers from anywhere with a... browser." This confirms the browser-based access model

which relies on HTTPS (typically on port 443).