[Dovecot] Connection queue full on dovecot 1.1.14 and 1.1.15

[Sven Eulberg]

Am 28.05.2009 um 09:36 schrieb Sven Eulberg:

> Hello,
>
> sometimes we get the following errors on out dovecot proxies:
>
> dovecot: May 27 20:06:10 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS handshaking
> dovecot: May 27 20:06:10 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS handshaking
> dovecot: May 27 20:06:10 Info: imap-login: Disconnected: Connection  
> queue full (auth failed, 1 attempts): user=<USER>, method=PLAIN,  
> REMOTE=<IP> LOCAL=<IP>
> dovecot: May 27 20:06:10 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS handshaking
> dovecot: May 27 20:06:10 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS handshaking
> dovecot: May 27 20:06:10 Info: imap-login: Disconnected: Connection  
> queue full (auth failed, 1 attempts): user=<USER>, method=PLAIN,  
> REMOTE=<IP> LOCAL=<IP>
> dovecot: May 27 20:06:10 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS handshaking
> dovecot: May 27 20:06:10 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS
> dovecot: May 27 20:06:11 Info: imap-login: Disconnected: Connection  
> queue full (auth failed, 1 attempts): user=<USER>, method=PLAIN,  
> REMOTE=<IP> LOCAL=<IP> TLS
> dovecot: May 27 20:06:12 Info: imap-login: Disconnected: Connection  
> queue full (auth failed, 1 attempts): user=<USER>, method=PLAIN,  
> REMOTE=<IP> LOCAL=<IP> TLS
> dovecot: May 27 20:06:15 Info: imap-login: Disconnected: Connection  
> queue full (auth failed, 1 attempts): user=<USER>, method=PLAIN,  
> REMOTE=<IP> LOCAL=<IP>
> dovecot: May 27 20:09:36 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS
> dovecot: May 27 20:09:36 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP>
> dovecot: May 27 20:09:36 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS handshaking
> dovecot: May 27 20:09:36 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS handshaking
> dovecot: May 27 20:09:36 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS handshaking
> dovecot: May 27 20:11:18 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS
> dovecot: May 27 20:11:18 Info: imap-login: Disconnected: Connection  
> queue full (auth failed, 1 attempts): user=<USER>, method=PLAIN,  
> REMOTE=<IP> LOCAL=<IP> TLS
> dovecot: May 27 20:39:22 Info: imap-login: Disconnected: Connection  
> queue full (no auth attempts): REMOTE=<IP> LOCAL=<IP> TLS handshaking
> dovecot: May 27 20:39:22 Info: imap-login: Disconnected: Connection  
> queue full (auth failed, 1 attempts): user=<USER>, method=PLAIN,  
> REMOTE=<IP> LOCAL=<IP> TLS
> dovecot: May 27 20:39:23 Info: imap-login: Disconnected: Connection  
> queue full (auth failed, 1 attempts): user=<USER>, method=PLAIN,  
> REMOTE=<IP> LOCAL=<IP>
>
> Our config:
>
> ./dovecot -n
> # 1.1.15: /usr/local/dovecot-1.1.15/etc/dovecot.conf
> # OS: Linux 2.6.18-6-686 i686 Debian 4.0
> base_dir: /usr/local/dovecot/var/run/dovecot/
> log_path: /var/log/dovecot-1.1.log
> protocols: pop3 pop3s imap imaps
> ssl_ca_file: /usr/local/dovecot/etc/ssl/de.TR_CRT
> ssl_cert_file: /usr/local/dovecot/etc/ssl/de.CRT
> ssl_key_file: /usr/local/dovecot/etc/ssl/de.PKEY
> disable_plaintext_auth: no
> login_dir: /usr/local/dovecot/var/run/dovecot/login
> login_executable(default): /usr/local/dovecot-1.1.15/libexec/dovecot/ 
> imap-login
> login_executable(imap): /usr/local/dovecot-1.1.15/libexec/dovecot/ 
> imap-login
> login_executable(pop3): /usr/local/dovecot-1.1.15/libexec/dovecot/ 
> pop3-login
> login_log_format_elements: user=<%u> method=%m REMOTE=%r LOCAL=%l %c
> login_process_per_connection: no
> login_greeting_capability(default): yes
> login_greeting_capability(imap): yes
> login_greeting_capability(pop3): no
> login_processes_count: 10
> login_max_processes_count: 256
> verbose_proctitle: yes
> mail_location: maildir:/home/email/%u/Maildir
> mailbox_idle_check_interval: 60
> mmap_disable: yes
> fsync_disable: yes
> mail_executable(default): /usr/local/dovecot-1.1.15/libexec/dovecot/ 
> imap
> mail_executable(imap): /usr/local/dovecot-1.1.15/libexec/dovecot/imap
> mail_executable(pop3): /usr/local/dovecot-1.1.15/libexec/dovecot/pop3
> mail_process_size: 512
> mail_plugins(default): quota imap_quota
> mail_plugins(imap): quota imap_quota
> mail_plugins(pop3): quota
> mail_plugin_dir(default): /usr/local/dovecot-1.1.15/lib/dovecot/imap
> mail_plugin_dir(imap): /usr/local/dovecot-1.1.15/lib/dovecot/imap
> mail_plugin_dir(pop3): /usr/local/dovecot-1.1.15/lib/dovecot/pop3
> imap_client_workarounds(default): delay-newmail outlook-idle  
> netscape-eoh tb-extra-mailbox-sep
> imap_client_workarounds(imap): delay-newmail outlook-idle netscape- 
> eoh tb-extra-mailbox-sep
> imap_client_workarounds(pop3):
> pop3_lock_session(default): no
> pop3_lock_session(imap): no
> pop3_lock_session(pop3): yes
> pop3_uidl_format(default): %08Xu%08Xv
> pop3_uidl_format(imap): %08Xu%08Xv
> pop3_uidl_format(pop3): %v.%u
> pop3_client_workarounds(default):
> pop3_client_workarounds(imap):
> pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
> auth default:
> mechanisms: plain login
> cache_size: 1024
> cache_ttl: 28800
> failure_delay: 3
> passdb:
>   driver: sql
>   args: /usr/local/dovecot/etc/dovecot-mysql.conf
>
>
> It seems to me the error occurs more often after increasing  
> login_processes_count.
> This errors exists with version 1.1.14 and 1.1.15 and I guess also  
> in earlier versions.
>
> Thanks in advance!
>
> Best regards,
> Sven
>

No idea?

Regards,
Sven