I have been running Dovecot 1.2.5 since Sept 14. Beginning at about 03:28 on Sept 21 for no apparent (to me) reason and continuing through the present, I am seeing log messages like the following and am experiencing delays logging in.
Sep 22 19:07:15 sbh16 dovecot: dovecot: Temporary failure in creating login processes, slowing down for now Sep 22 19:07:15 sbh16 dovecot: pop3-login: Fatal: io_loop_handle_add: epoll_ctl(1, 5): Operation not permitted Sep 22 19:07:48 sbh16 dovecot: pop3-login: Login: user=<mark>, method=APOP, rip=68.183.193.239, lip=72.52.113.16, TLS Sep 22 19:07:48 sbh16 dovecot: POP3(mark): Disconnected: Logged out top=0/0, retr=0/0, del=0/218, size=2550090 Sep 22 19:08:15 sbh16 dovecot: dovecot: Created login processes successfully, unstalling Sep 22 19:08:15 sbh16 dovecot: dovecot: Temporary failure in creating login processes, slowing down for now Sep 22 19:08:15 sbh16 dovecot: dovecot: child 21735 (login) returned error 89 (Fatal failure) Sep 22 19:08:15 sbh16 dovecot: pop3-login: Fatal: io_loop_handle_add: epoll_ctl(1, 5): Operation not permitted Sep 22 19:08:21 sbh16 dovecot: pop3-login: Login: user=<mark>, method=APOP, rip=68.183.193.239, lip=72.52.113.16, TLS Sep 22 19:08:22 sbh16 dovecot: POP3(mark): Disconnected: Logged out top=0/0, retr=1/57566, del=0/218, size=2550090 Sep 22 19:09:15 sbh16 dovecot: dovecot: Created login processes successfully, unstalling
Is this a dovecot issue, some other issue or perhaps some kind of denial of service attack?
Here's my dovecot -n
# 1.2.5: /usr/local/etc/dovecot.conf # OS: Linux 2.6.18-8.1.14.el5 i686 CentOS release 5 (Final) protocols: pop3 pop3s imap imaps ssl_cert_file: /etc/postfix/sbh16-cert.pem ssl_key_file: /etc/postfix/sbh16-key.pem login_dir: /usr/local/var/run/dovecot/login login_executable(default): /usr/local/libexec/dovecot/imap-login login_executable(imap): /usr/local/libexec/dovecot/imap-login login_executable(pop3): /usr/local/libexec/dovecot/pop3-login mail_privileged_group: mail mail_location: mbox:~/Mail:INBOX=/var/spool/mail/%u mbox_write_locks: fcntl dotlock mail_executable(default): /usr/local/libexec/dovecot/imap mail_executable(imap): /usr/local/libexec/dovecot/imap mail_executable(pop3): /usr/local/libexec/dovecot/pop3 mail_plugin_dir(default): /usr/local/lib/dovecot/imap mail_plugin_dir(imap): /usr/local/lib/dovecot/imap mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3 lda: postmaster_address: postmaster@example.com auth default: mechanisms: plain apop login worker_max_count: 5 passdb: driver: passwd-file args: /usr/local/etc/dovecot.passwd passdb: driver: pam userdb: driver: passwd socket: type: listen client: path: /var/spool/postfix/private/auth mode: 432 user: postfix group: postfix [root@sbh16 ~]#
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