syncserver suddenly refused connection from master

[Marcus Schopen]

Hi,

my syncserver suddenly refused connection from its master this evening.
The master/slave setup is running without any problems for half a year
now.

On slave/replica side I found in /var/log/mail.err

Sep 11 23:51:19 replica cyrus/syncserver[27328]: refused connection from
xxx.xxx.xxx.xxx

On master side /var/log/mail.err:
Sep 11 23:43:33 master cyrus/sync_client[31324]: couldn't authenticate
to backend server: no mechanism available

I restarted cyrus on slave side and replication started to work again. I
couldn't find anything weird in the logfiles on slave or master side, so
anything to be worried about?

I'm running cyrus 2.4.12 on Ubuntu 12.04 LTS on both sides.

Ciao!

---------------------
Sep 11 23:16:19 replica cyrus/syncserver[27328]: accepted connection
Sep 11 23:16:19 replica cyrus/syncserver[27328]: cmdloop(): startup
Sep 11 23:17:19 replica cyrus/syncserver[27328]: accepted connection
Sep 11 23:17:19 replica cyrus/syncserver[27328]: cmdloop(): startup
Sep 11 23:17:47 replica cyrus/syncserver[27328]: accepted connection
Sep 11 23:17:47 replica cyrus/syncserver[27328]: cmdloop(): startup
Sep 11 23:17:47 replica cyrus/syncserver[27328]: SSL_accept() incomplete
-> wait
Sep 11 23:17:47 replica cyrus/syncserver[27328]: SSL_accept() succeeded
-> done
Sep 11 23:17:47 replica cyrus/syncserver[27328]: starttls: TLSv1 with
cipher DHE-RSA-AES256-SHA (256/256 bits new) no authentication
Sep 11 23:17:47 replica cyrus/syncserver[27328]: login: master
[xx.xx.xx.xx] userxxx PLAIN+TLS User logged in
Sep 11 23:18:19 replica cyrus/syncserver[31979]: accepted connection
Sep 11 23:18:19 replica cyrus/syncserver[31979]: cmdloop(): startup
Sep 11 23:19:19 replica cyrus/syncserver[31979]: accepted connection
Sep 11 23:19:19 replica cyrus/syncserver[31979]: cmdloop(): startup
Sep 11 23:20:19 replica cyrus/syncserver[31979]: accepted connection
Sep 11 23:20:19 replica cyrus/syncserver[31979]: cmdloop(): startup
Sep 11 23:21:19 replica cyrus/syncserver[31979]: accepted connection
Sep 11 23:21:19 replica cyrus/syncserver[31979]: cmdloop(): startup
Sep 11 23:22:19 replica cyrus/syncserver[31979]: accepted connection
Sep 11 23:22:19 replica cyrus/syncserver[31979]: cmdloop(): startup
Sep 11 23:23:19 replica cyrus/syncserver[31979]: accepted connection
Sep 11 23:23:19 replica cyrus/syncserver[31979]: cmdloop(): startup
Sep 11 23:24:19 replica cyrus/syncserver[31979]: refused connection from
xx.xx.xx.xx
Sep 11 23:25:20 replica cyrus/syncserver[31979]: refused connection from
xx.xx.xx.xx
Sep 11 23:26:19 replica cyrus/syncserver[31979]: refused connection from
xx.xx.xx.xx
Sep 11 23:27:19 replica cyrus/syncserver[31979]: refused connection from
xx.xx.xx.xx
Sep 11 23:27:48 replica cyrus/syncserver[31979]: refused connection from
xx.xx.xx.xx
Sep 11 23:28:03 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:28:19 replica cyrus/syncserver[31979]: refused connection from
xx.xx.xx.xx
Sep 11 23:28:33 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:29:19 replica cyrus/syncserver[31979]: refused connection from
xx.xx.xx.xx
Sep 11 23:29:33 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:30:19 replica cyrus/syncserver[31979]: refused connection from
xx.xx.xx.xx
Sep 11 23:31:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:31:33 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:32:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:33:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:34:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:35:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:35:33 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:36:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:37:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:38:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:39:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:40:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:41:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:42:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:43:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:43:33 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:44:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:45:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:46:20 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:47:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:48:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:49:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:50:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:51:19 replica cyrus/syncserver[27328]: refused connection from
xx.xx.xx.xx
Sep 11 23:52:20 replica cyrus/syncserver[27328]: accepted connection
Sep 11 23:52:20 replica cyrus/syncserver[27328]: cmdloop(): startup
Sep 11 23:53:19 replica cyrus/syncserver[27328]: accepted connection
Sep 11 23:53:19 replica cyrus/syncserver[27328]: cmdloop(): startup
Sep 11 23:54:19 replica cyrus/syncserver[27328]: accepted connection
Sep 11 23:54:19 replica cyrus/syncserver[27328]: cmdloop(): startup
Sep 11 23:55:19 replica cyrus/syncserver[27328]: accepted connection
Sep 11 23:55:19 replica cyrus/syncserver[27328]: cmdloop(): startup
Sep 11 23:56:19 replica cyrus/syncserver[27328]: accepted connection
Sep 11 23:56:19 replica cyrus/syncserver[27328]: cmdloop(): startup
Sep 11 23:57:19 replica cyrus/syncserver[27328]: accepted connection
Sep 11 23:57:19 replica cyrus/syncserver[27328]: cmdloop(): startup
Sep 11 23:58:19 replica cyrus/syncserver[6993]: executed

---> restart cyrus

Sep 11 23:58:19 replica cyrus/syncserver[6993]: accepted connection
Sep 11 23:58:19 replica cyrus/syncserver[6993]: cmdloop(): startup
Sep 11 23:59:19 replica cyrus/syncserver[6993]: accepted connection
Sep 11 23:59:19 replica cyrus/syncserver[6993]: cmdloop(): startup
Sep 11 23:59:33 replica cyrus/syncserver[6993]: accepted connection
Sep 11 23:59:33 replica cyrus/syncserver[6993]: cmdloop(): startup
Sep 11 23:59:33 replica cyrus/syncserver[6993]: imapd:Loading hard-coded
DH parameters
Sep 11 23:59:33 replica cyrus/syncserver[6993]: SSL_accept() incomplete
-> wait
Sep 11 23:59:33 replica cyrus/syncserver[6993]: SSL_accept() succeeded
-> done
Sep 11 23:59:33 replica cyrus/syncserver[6993]: starttls: TLSv1 with
cipher DHE-RSA-AES256-SHA (256/256 bits new) no authentication
Sep 11 23:59:33 replica cyrus/syncserver[6993]: login: master
[xx.xx.xx.xx] userxxx PLAIN+TLS User logged in
Sep 12 00:00:19 replica cyrus/syncserver[7089]: executed
Sep 12 00:00:19 replica cyrus/syncserver[7089]: accepted connection
Sep 12 00:00:19 replica cyrus/syncserver[7089]: cmdloop(): startup
Sep 12 00:01:19 replica cyrus/syncserver[7089]: accepted connection
Sep 12 00:01:19 replica cyrus/syncserver[7089]: cmdloop(): startup
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