How can I verify network connectivity when encountering the 'unhandled error err= couldn't get current server api group list' error?

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Grade: Education Subject: Support
How can I verify network connectivity when encountering the 'unhandled error err= couldn't get current server api group list' error?
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Use tools like `ping`, `traceroute`, or `telnet` to check if the client can reach the API server's IP address and port (typically 6443). Ensure there are no firewall rules blocking the connection between the client and server. Also check any proxy configurations which could be affecting the connection.