On Wed, 2007-08-29 at 10:06 +0800, Joshua, C.S. Chen wrote:
Hi folks, My institute's mail server was upgraded to RHEL5 with dovecot 1.0-2.1rc5 recently. And it uses PAM authentication which points to LDAP server. Now from time to time it gets Error like
rc5 is pretty old. There are v1.0.x packages for RHEL5.
dovecot: Aug 29 09:23:59 Error: auth(default): pam(joshua,192.168.177.52): pipe() failed: Too many open files
Look at dovecot-auth process's list of open files:
ls -l /proc/pidof dovecot-auth/fd/
How many are there and what are opened most of the time?
auth default: passdb: driver: pam userdb: driver: passwd
Are you using also nss_ldap? See http://wiki.dovecot.org/AuthDatabase/Passwd. With rc5 you can't fix it properly, and that could also be the cause of your problems.