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Jul 07, 2019 Troubleshooting DNS Servers | Microsoft Docs Check whether the secondary server is running another DNS server implementation, such as BIND. If it is, the problem might have one of the following causes: The Windows master server might be configured to send fast zone transfers, but the third-party secondary server might not support fast-zone transfers. Test-DnsServer
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Speedtest by Ookla - The Global Broadband Speed Test Test your Internet connection bandwidth to locations around the world with this interactive broadband speed test from Ookla How to Test DNS Server Response Time to Troubleshoot Site Nov 07, 2019