In general, port 80 is the default port on your computer for TCP/IP connections. Because the report server listens on port 80, you can ignore the port number in the URL. If you specify another port, you must specify that port in the URL.
For more details, you can refer to this link: https://learn.microsoft.com/en-us/sql/reporting-services/install-windows/configure-report-server-urls-ssrs-configuration-manager?view=sql-server-ver16#default-urls.
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