empty response

[delphinuz]

使用一段时间后(大约几分钟，没有固定)，就会在dns log里发现大量的 empty response(无论有无cached)。

怎么发现这问题？应用一直无法连线，排查后才发现是dns无法正常解析。

每次重置xray后就正常，但几分钟后又复现。

估计与 dns cache有关，还请大神看一下。

DOHL//1.1.1.1 got answer: ctldl.windowsupdate.com -> [2606:2800:11f:85d:13e0:11e9:1a6:201d, 67.26.163.254, 8.250.187.254, 8.252.188.126, 8.250.175.254, 8.249.21.254] 554.0207ms
DOHL//1.1.1.1 got answer: wdcp.microsoft.com -> [] 674.0201ms <empty response>
DOHL//1.06:29:54 DOHL//1.1.1.1 cache HIT: nav.smartscreen.microsoft.com -> [] <empty response>

127.0.0.1:1046 accepted //nav.smartscreen.microsoft.com:443 [http-in -> direct]
DOHL//1.1.1.1 cache HIT: nav.smartscreen.microsoft.com -> [] <empty response>
127.0.0.1:1049 accepted //nav.smartscreen.microsoft.com:443 [http-in -> direct]
DOHL//1.1.1.1 cache HIT: nav.smartscreen.microsoft.com -> [] <empty response>1.1.1 got answer: wdcp.microsoft.com -> [] 828.0115ms <empty response>