> On 10 April 2019 21:26 Laura Smith via dovecot <dovecot@dovecot.org> wrote: > > > === > dsync(foo...@example.com): Error: imapc(foobar.example.com:993): > dns_lookup(foobar.example.com) failed: read(/var/run/dovecot/dns-client) > failed: read(size=512) failed: Connection reset by peer >
This is dovecot's internal dns-client, and something goes wrong when talking to the service. > dsync(foo...@example.com): Error: Failed to initialize user: imapc: Login to > foobar.example.com failed: Disconnected from server This is btw dsync service, not imap service. > === > > Initially I thought "oh no, not another AppArmor block". > > But then surely the second message would not appear if the DNS lookup was not > successful ? > > Also "dig foobar.example.com" works fine. > > How should I be troubleshooting this ? And if it is still likely to be > AppArmor, what is calling it ? "doveadm" itself or something else ? What > does "/var/run/dovecot/dns-client" do and why doesn't dovecot use standard OS > calls like everyone else ? > Because the "standard OS call" is blocking and we would prefer it to not block everything else. > So many questions ! Aki
