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=
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 =
ssl_key =
driver = passwd
}
protocol imap {
mail_max_userip_connections = 100
}
protocol pop3 {
mail_max_userip_connections = 100
}
Best regards,
Jason