Quoting "Walter H. via Info-cyrus" <info-cyrus at lists.andrew.cmu.edu>: > on my CentOS6 I see this error > Jun 12 08:02:33 mail master[1941]: setrlimit: Unable to set file > descriptors limit to -1: Operation not permitted It is normal-ish. It might be useful to look at /etc/security/limits.conf and ulimits in general.