[Dovecot] dovecot temporary suspension all of pop3 login about 5 minutes

[Jason]

Dear All，

 

When the user login P0P3 more than 10 times in 1 minute that the dovecot temporary suspension all of pop3 login about 5 minutes.

How to disable the setting for dovecot.

 

Mail Log:

Apr 24 16:11:14 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8767, session=<5USPZMX3/QDAqBBU> 

Apr 24 16:11:14 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0 

Apr 24 16:11:15 mww dovecot: auth-worker: Error: no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory 

Apr 24 16:11:15 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8769, session=<GzyeZMX3/wDAqBBU> 

Apr 24 16:11:15 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0 

Apr 24 16:11:16 mww dovecot: auth-worker: Error: no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory 

Apr 24 16:11:16 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8771, session=<bGSsZMX3AQDAqBBU> 

Apr 24 16:11:16 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0 

Apr 24 16:11:17 mww dovecot: auth-worker: Error: no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory 

Apr 24 16:11:17 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8773, session=<ASq6ZMX3AwDAqBBU>

Apr 24 16:11:17 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0 

Apr 24 16:11:18 mww dovecot: auth-worker: Error: no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory 

Apr 24 16:11:18 mww dovecot: pop3-login: Login: user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, mpid=8775, session=<Ux3JZMX3BQDAqBBU> 

Apr 24 16:11:18 mww dovecot: pop3(scan): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0 

Apr 24 16:11:23 mww dovecot: pop3-login: Disconnected (auth failed, 1 attempts in 4 secs): user=<scan>, method=PLAIN, rip=192.168.16.84, lip=192.168.16.159, session=<kP3WZMX3BwDAqBBU> 

Apr 24 16:12:04 mww dovecot: pop3-login: Disconnected (auth failed, 1 attempts in 4 secs): user=<jason>, method=PLAIN, rip=192.168.16.59, lip=192.168.16.159, session=<WX9NZ8X3pwDAqBA7>

 

Dovecot v2.2.9 

 

# 2.2.9: /etc/dovecot/dovecot.conf

doveconf: Warning: NOTE: You can get a new clean config file with: 

doveconf -n > dovecot-new.conf

doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:99: 

ssl_disable has been renamed to ssl

# OS: Linux 3.13.0-24-generic x86_64 Ubuntu 14.04 LTS disable_plaintext_auth = no mail_location = mbox:~/mail:INBOX=/var/mail/%u namespace inbox {

   inbox = yes

   location =

   mailbox Drafts {

     special_use = \Drafts

   }

   mailbox Junk {

     special_use = \Junk

   }

   mailbox Sent {

     special_use = \Sent

   }

   mailbox "Sent Messages" {

     special_use = \Sent

   }

   mailbox Trash {

     special_use = \Trash

   }

   prefix =

}

passdb {

   driver = pam

}

plugin {

   sieve = ~/.dovecot.sieve

   sieve_dir = ~/sieve

}

protocols = " imap pop3"

ssl = no

ssl_cert = </etc/dovecot/dovecot.pem

ssl_key = </etc/dovecot/private/dovecot.pem userdb {

   driver = passwd

}

protocol imap {

   mail_max_userip_connections = 100

}

protocol pop3 {

   mail_max_userip_connections = 100

}

 

 

Best regards,

 

Jason