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

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You have been subscribed to a public bug by Ubuntu Foundations Team Bug Bot (crichton):

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
     Importance: Unknown
         Status: New

** Affects: systemd (Ubuntu)
     Importance: High
     Assignee: Jorge Niedbalski (niedbalski)
         Status: In Progress

** Affects: systemd (Ubuntu Xenial)
     Importance: High
     Assignee: Jorge Niedbalski (niedbalski)
         Status: In Progress

** Affects: systemd (Ubuntu Bionic)
     Importance: High
     Assignee: Jorge Niedbalski (niedbalski)
         Status: In Progress

** Affects: systemd (Ubuntu Disco)
     Importance: High
     Assignee: Jorge Niedbalski (niedbalski)
         Status: In Progress

** Affects: systemd (Ubuntu Eoan)
     Importance: High
     Assignee: Jorge Niedbalski (niedbalski)
         Status: In Progress


** Tags: canonical-bootstack patch
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systemd-resolved negative caching for extended period of time
https://bugs.launchpad.net/bugs/1668771
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