[Bug 1668771] [NEW] systemd-resolved negative caching for extended period of time

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Public bug reported:

231-9ubuntu3

If a DNS lookup returns SERVFAIL, systemd-resolved seems to cache the
result for very long (infinity?). I have to restart systemd-resolved to
have the negative caching purged.

After SERVFAIL DNS server issue has been resolved, chromium/firefox
still returns DNS error despite host can correctly resolve the name.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1668771

Title:
  systemd-resolved negative caching for extended period of time

Status in systemd package in Ubuntu:
  New

Bug description:
  231-9ubuntu3

  If a DNS lookup returns SERVFAIL, systemd-resolved seems to cache the
  result for very long (infinity?). I have to restart systemd-resolved
  to have the negative caching purged.

  After SERVFAIL DNS server issue has been resolved, chromium/firefox
  still returns DNS error despite host can correctly resolve the name.

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