dovecot - Jun 2005 - dovecot - outlook users keep getting locked out of imap

Greetings:

My outlook users accessing mail via dovecot's imaps have been consistantly
getting locked out of their email. It happens about once a week per
outlook user. It appears to happen when the are cliking on emails with
attachments.  When this happens, there are two imap deamons running for
that user.  I kill both deamons and things start working again.  
Squirrelmail, thunderbird and pine users haven't had this issue.  I'm 
running a version of dovecot dated dovecot-stable-20050610.

All user accounts have their mail on nfs mount points. The INBOX directory
is local to the imap server but we have a smtp server that gets this data
via nfs. Below is the dovecot.conf info:

	base_dir = /var/run/dovecot/
	protocols = imap imaps

	ssl_disable = no
	ssl_cert_file = /usr/local/imaps/certs/dovecot_cert.pem
	ssl_key_file =  /usr/local/imaps/certs/dovecot_key.pem

	disable_plaintext_auth = yes
	login_dir = /var/run/dovecot/login

	login_process_size = 128
	login_processes_count = 9
	login_max_processes_count = 256
	login_max_logging_users = 512
	verbose_proctitle = yes

	mail_extra_groups = mail
	default_mail_env = mbox:~/mail/:INBOX=/var/spool/mail/%u

	mmap_disable = no
	lock_method = fcntl

	mbox_read_locks = fcntl
	mbox_write_locks = dotlock fcntl

	mbox_lock_timeout = 300
	mbox_dotlock_change_timeout = 30
	mbox_dirty_syncs = yes
	mbox_very_dirty_syncs = no

	protocol imap {
	  imap_client_workarounds = outlook-idle
	}
  
	protocol pop3 {
	}

	auth default {
	  mechanisms = plain
	  passdb = pam
	  userdb = passwd
	  user = root
	}

Your assistance is greatly appreciated.

Thanks,
Anthony

On 28.6.2005, at 22:29, Anthony Kolasny wrote:
> My outlook users accessing mail via dovecot's imaps have been 
> consistantly
> getting locked out of their email. It happens about once a week per
> outlook user. It appears to happen when the are cliking on emails with
> attachments.  When this happens, there are two imap deamons running for
> that user.  I kill both deamons and things start working again.
Could you check with strace/ktrace/whatever what the processes are 
doing? Are they holding any file locks?
> Squirrelmail, thunderbird and pine users haven't had this issue. 
I'm
> running a version of dovecot dated dovecot-stable-20050610.
Possibly because Outlook opens multiple connections to same mailbox.
> All user accounts have their mail on nfs mount points. The INBOX 
> directory
> is local to the imap server but we have a smtp server that gets this 
> data
> via nfs. Below is the dovecot.conf info:
..
> 	default_mail_env = mbox:~/mail/:INBOX=/var/spool/mail/%u
So you're keeping Dovecot's indexes in NFS? There are some problems 
with it. Are you using only computer as IMAP server or are there 
multiple? Storing the indexes locally might be a good idea if the users 
normally get logged into same server:

default_mail_env = 
mbox:~/mail/:INBOX=/var/spool/mail/%u:INDEX=/var/indexes/%u
> 	mmap_disable = no
If indexes are stored in NFS and multiple computers are accessing the 
same mailbox, this must be set to yes. Probably should be set to yes in 
any case with NFS.
> 	lock_method = fcntl
>
> 	mbox_read_locks = fcntl
> 	mbox_write_locks = dotlock fcntl
And lockd is working fine? I've heard it has always had problems.. 
Dovecot wouldn't mind if you set all of these to just dotlock.
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