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Calling WinSock and WinHttp inline causes DNS Cache TTL not be honored RRS feed

  • Question

  • Thank you for any insight that can be brought to this issue.

    GetAddrInfoW and WinHttpSendRequest are used in a Windows 7 x64 SP1 fully updated environment.  A simple C++ console application makes a call to GetAddrInfoW and then call WinHttpSendRequest.  When monitoring with Network Monitor using the DNS filter.  The DNS query resolves with a TTL of 240 seconds.  Five seconds later the application loops again making the same requests after closing the handles, and the DNS query is made again even though the DNS Cache TTL has not expired.

    The DNS Cache TTL is not honored only when on private DNS.

    The DNS Cache TTL is honored when off the private DNS.

    How could the DNS effect the DNS Cache from being honored on the client?

    Wednesday, April 26, 2017 2:52 AM

All replies

  • Hi, 

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    Tuesday, May 2, 2017 5:31 AM
    Moderator