When I input the URL apod.nasa.gov into any Web browser on my Win 10 1903 Ethernet/fiber-connected tower, the status line says it's doing a TLS handshake with the site, but just sits there, and never connects, eventually giving the error "Problem loading page. Secure connection failed. PR_CONNECT_RESET_ERROR". What's weird is that I have the same 1903 on my ASUS U50f laptop, which connects to APOD fine there wirelessly, via the same router (a Linksys E1200). Any ideas? Thanks!

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DUH. It was the router itself. I power-cycled it, and now the site handshaking is working fine.