How can I test network connectivity to the ArcGIS Data Store or Portal when encountering error 99999?

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Grade: Education Subject: Support
How can I test network connectivity to the ArcGIS Data Store or Portal when encountering error 99999?
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Use tools like `ping`, `tracert` (or `traceroute`), and `telnet` to test network connectivity to the ADS or Portal server. Verify DNS resolution is working correctly. You can also use a web browser to access the Portal's login page to confirm basic HTTP connectivity.