Hi all! I`m using dovecot for a while with no problems. Some days ago it started to delay the authentication until the timeout.

syslog...

Oct 3 09:00:10 coan dovecot: auth(default): pam(rodrigo.botan,121.120.119.179): pipe() failed: Too many open files Oct 3 09:00:11 coan dovecot: auth(default): pam(katia,121.120.200.97): pipe() failed: Too many open files Oct 3 09:00:11 coan dovecot: auth(default): pam(andersoncampos,121.120.200.35): pipe() failed: Too many open files

Oct 3 08:25:55 coan dovecot: pop3-login: Disconnected: Inactivity: method=PLAIN, rip=121.120.119.39, lip=121.120.119.251 Oct 3 08:25:58 coan dovecot: pop3-login: Disconnected: Inactivity: method=PLAIN, rip=121.120.119.94, lip=121.120.119.251 Oct 3 08:26:01 coan dovecot: pop3-login: Disconnected: Inactivity: method=PLAIN, rip=121.120.119.148, lip=121.120.119.251

After the commands

/etc/init.d/dovecot stop killall -9 dovecot-auth /etc/init.d/dovecot start

It come back to work, then after some time, I need to restart again and again... I tried 'ulimit -n 5000' in /etc/init.d/dovecot, but the problem remains.

The problem is in the authentication backend, I guess. I`m using PAM, so I leaved only one line in /etc/pam.d/dovecot:

auth sufficient pam_permit.so

and all worked fine. Of course, just for test, since this allows login with any password.

My system: Debian Etch 64bit dovecot version: 1.0.rc15 (from etch repositories) PAM lib version: 0.79-5 (from etch repositories) The system has 200 users, with 30 logins per minute. hardware: Intel(R) Xeon(R) CPU 3050 @ 2.13GHz, 2GB RAM.

If you have some pointer to the solution, it will be welcome.

Thank you,

Tom Lobato