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Dear all!
I'm stuck.
I've got a dovecot IMAP server running (TLS, port 149) on Ubuntu 13.04 server behind a DSL router. The mailserver's IP is 10.0.0.1
When I connect to my mailbox from my intranet-PC (10.0.0.2), everything works as expected. Login OK, acces to all mailboxes is ok, everything.
netstat -nt on my email server shows me:
Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 10.0.0.1:143 10.0.0.2:57952 ESTABLISHED
and /var/log/mail.log shows me: Aug 24 22:41:00 SERVERNAME dovecot: imap-login: Login: user=<UID>, method=PLAIN, rip=10.0.0.2, lip=10.0.0.1, mpid=24326, TLS, session=<3Ul+irfkYAAKAAAC>
However, when I connect to my mailserver through the internet (from 10.196.124.7 which is a modem of my ISP), dovecot ignores the authentication request. It does nothing. Just nothing.
My router forwards the connection request to my mailserver correctly, so port forwarding on the router is ok, as my mailserver gets a connection request from the client. Proof: "netstat -nt" shows me:
Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 10.0.0.1:143 10.196.124.7:1024 SYN_RECV
So, my server gets a connection request on port 143 from my client PC, but then nothing happens. By nothing I mean, that nothing gets written into /var/log/mail.log and my email client (Thunderbird) gets a connection timeout.
Any ideas why dovecot is refusing connections? How can I solve this problem?
thanx all Sulla
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