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I´m trying to configure a dovecot imap server but I´m having some problems with the imap port in my firewall.

I use the APF (advance policy firewall) for managing iptables on a centos server. I try to open the 143 port, but with every nmap, the port appears as "filtered", and I´m unable to connect to imap from the mail client.

Any idea? Thanks in advance!

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I would test the port with telnet or ncat to make sure the firewall doesn't have something that blocks scans.

telnet imap-server-ip 143

If that doesn't work, post your iptables rules:

sudo iptables -L -v
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  • argggh, your answer made me remember that we have our offices under a firewall with the imap port closed, so the problem was here, not in the remote servers... arghhh... thanks for all!
    – Simon
    Aug 27, 2009 at 16:22

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