我们遇到了一种奇怪的情况，我们的 DNS/域控制器不断失去连接到根提示服务器的能力。这种情况持续约 5 分钟，每天都会发生几次。
当这种情况发生时，我们跳转到 DNS 服务器并打开了命令提示符，并且能够从 DNS 服务器成功手动 ping 根提示服务器，因此我们知道这不是互联网连接问题。
我们在事件期间运行了 dcdiag，发现 DNS 服务器能够相互连接，但无法连接到根提示服务器。
DNS server: 8.8.4.4 (<name unavailable>)
9 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 8.8.4.4 [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
DNS server: 8.8.8.8 (<name unavailable>)
9 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 8.8.8.8 [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
DNS server: 192.112.36.4 (g.root-servers.net.)
8 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.112.36.4 [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
DNS server: 192.203.230.10 (e.root-servers.net.)
8 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.203.230.10 [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
DNS server: 192.228.79.201 (b.root-servers.net.)
8 test failure on this DNS server
发生这种情况时，我们将无法解析 FQDN
非常感谢您的帮助。