HRESULT 0x80072F84 (WININET_E_SERVER

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WININET_E_SERVER_UNREACHABLE means WinINet could not establish communication with the target server.

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WININET_E_DISCONNECTED	WININET_E_PROXY_SERVER_UNREACHABLE

WININET_E_SERVER_UNREACHABLE

WININET_E_SERVER_UNREACHABLE is a WinINet HRESULT. It means that WinINet could not establish communication with the target server. DNS, routing, firewall, server availability, port configuration, proxy policy or TLS negotiation can be involved.

Diagnostic discriminator: Test the same host and port from the affected machine through the same proxy, VPN and firewall policy. Successful DNS resolution with no reachable TCP path points to routing, filtering or server availability; successful connection from another network points back to the local path. Preserve the resolved address and failing route before changing retry policy.

What to check for WININET_E_SERVER_UNREACHABLE

Verify the resolved address, route, port and firewall path from the affected machine.
Test the destination through the same proxy and VPN configuration used by the application.
Check server availability and load balancer health before changing client retry behavior.

Microsoft documentation

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