I currently have a server with centos 4.3 setup to do email. I use sendmail as the receiving agent and Dovecot as the pop/imap server. Users authenticate off of a openldap server. Under a light load things appear to work fine. However under a moderately heavy load connections are left open in a waiting state. This causes some email to bounce with user unknown, users authentications fails with bad username/password all with valid accounts.
I am trying to figure out what the cause is to fix it but with out success. By restarting ldap and the ldap server I can minimize the problem because the connections get reset. I find nothing when I google on the subject. I don't believe this is a problem with the ldap server because I have a Fedora core machine using it without problems.
Any help or ideas on how to track down the problem would be appreciated.
Myron Williams