Seems like the issue documented here:
http://sourceforge.net/mailarchive/message.php?msg_id=29313457 and 
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=669146

Regards,
David

On 7/10/2012 12:55 PM, Sylvain GARGASSON wrote:
> Hi, I use postfix with courier SASL and rouncube.
>
> When I boot everything works fine, after sometime I can't connect to the
> imap anymore.
>
> I don't see something special on logs :-/
>
> When I restart every courier, postfix et sasl services. That doesn't
> work better...
>
> To work again, i need a reboot...
>
> Here is log when it's OK:
>
> Jul 10 15:34:50 ns235498 imapd: Connection, ip=[::ffff:127.0.0.1]
> Jul 10 15:35:02 ns235498 authdaemond: received auth request,
> service=imap, authtype=login
> Jul 10 15:35:02 ns235498 authdaemond: authmysql: trying this module
> Jul 10 15:35:02 ns235498 authdaemond: SQL query: SELECT email, password,
> "", 5000, 5000, "/home/vmail",
> CONCAT(SUBSTRING_INDEX(email,'@',-1),'/',SUBSTRING_INDEX(email,'@',1),'/'),
> quota, "", "" FROM users WHERE email = '[email protected]'
> Jul 10 15:35:02 ns235498 authdaemond: password matches successfully
> Jul 10 15:35:02 ns235498 authdaemond: authmysql: sysusername=<null>,
> sysuserid=5000, sysgroupid=5000, homedir=/home/vmail,
> [email protected], fullname=<null>,
> maildir=domain.exemple/user/, quota=2147483647, options=<null>
> Jul 10 15:35:02 ns235498 authdaemond: authmysql: clearpasswd=<null>,
> passwd=LCbKsQjemgak.
> Jul 10 15:35:02 ns235498 authdaemond: Authenticated: sysusername=<null>,
> sysuserid=5000, sysgroupid=5000, homedir=/home/vmail,
> [email protected], fullname=<null>,
> maildir=domain.exemple/user/, quota=2147483647, options=<null>
> Jul 10 15:35:02 ns235498 authdaemond: Authenticated:
> clearpasswd=XXXXXXXX, passwd=LCbKsQjemgak.
> Jul 10 15:35:02 ns235498 imapd: LOGIN, [email protected],
> ip=[::ffff:127.0.0.1], port=[57471], protocol=IMAP
>
> Here is log when it's NOT OK:
>
> Jul 10 18:30:13 ns235498 imapd: Connection, ip=[::ffff:127.0.0.1]
> Jul 10 18:30:13 ns235498 authdaemond: received auth request,
> service=imap, authtype=login
> Jul 10 18:30:13 ns235498 authdaemond: authmysql: trying this module
> Jul 10 18:30:13 ns235498 authdaemond: authmysqllib: connected. Versions:
> header 50517, client 50524, server 50524
> Jul 10 18:30:13 ns235498 authdaemond: SQL query: SELECT email, password,
> "", 5000, 5000, "/home/vmail",
> CONCAT(SUBSTRING_INDEX(email,'@',-1),'/',SUBSTRING_INDEX(email,'@',1),'/'),
> quota, "", "" FROM users WHERE email = '[email protected]'
> Jul 10 18:30:13 ns235498 authdaemond: password matches successfully
> Jul 10 18:30:13 ns235498 authdaemond: authmysql: sysusername=<null>,
> sysuserid=5000, sysgroupid=5000, homedir=/home/vmail,
> [email protected], fullname=<null>,
> maildir=domain.exemple/user/, quota=2147483647, options=<null>
> Jul 10 18:30:13 ns235498 authdaemond: authmysql: clearpasswd=<null>,
> passwd=LCbKsQjemgak.
> Jul 10 18:30:13 ns235498 authdaemond: Authenticated: sysusername=<null>,
> sysuserid=5000, sysgroupid=5000, homedir=/home/vmail,
> [email protected], fullname=<null>,
> maildir=domain.exemple/user/, quota=2147483647, options=<null>
> Jul 10 18:30:13 ns235498 authdaemond: Authenticated:
> clearpasswd=XXXXXXXX, passwd=LCbKsQjemgak.
>
> THE TWO ONLY DIFFERENCE ARE:
>
> the line Jul 10 18:30:13 ns235498 authdaemond: authmysqllib: connected.
> Versions: header 50517, client 50524, server 50524 ARE NOT PRESENT WHEN
> IT'S WORKING
>
> AND
>
> IMAP NEVER TAKEOVER HAND WHEN NOT WORKING.
>
> Could you please help me with this headake
>
> Thx in adv...
>
>
>
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