After upgrading 4.5.5 to 4.5.7 on Fedora Core 5 Zimbra ran fine for aprox. one day and then we've noticed the POP3 / IMAP services stopped responding. After restarting Zimbra (and even the operating system) a few times we've got still the same situation. I ran install.sh again to let it 'upgrade' the installation (hoping it would fix something), but to no avail.
I can't find anything similar to this situation in the forum. Could somebody please help me out?