I seem to have an odd problem that I cannot explain. Running latest ISP config on Debian Etch (with OSSECC-HIDS). MY users are intermittently unable to download their mail. SMTP is fine, and the Webmail interface is fine, but they cannot seem to access postfix through pop3 client. If I reboot the server they can access for a few minutes, but then start getting connection errors. It will intermittently start and stop working. Outlook can find the mail server but cannot log in, thunderbird just stalls on connect, and Evolution states that the mail server returned an unexpected response. I Cannot seem to find any problems in the server's logs; syslog, mail.log, wail.warn, mail.err. I am I missing a place which I should be looking for an answer? Thanks in advance for your help.