[Dovecot] pop3 seems to be down sometimes

[Timo Sirainen]

On Tue, 2007-03-20 at 12:39 +0100, Thomas Balsfulland wrote:
> i am using dovecot v1.0.rc15-1~bpo1 from backports.org on a debian sarge
> machine as pop3 pop3s imap and imaps server.
> since some days it seems the pop-server will stop randomly. noone is
> able get mails, but imap is still working. the logfile says:

When it happens, try logging in manually. What exactly happens? Does it
write the "+OK Dovecot ready"? Does it reply to commands? Does it hang
only after you've given PASS command? See
http://wiki.dovecot.org/TestPop3Installation

> dovecot: 2007-03-19 16:44:19 Info: auth(default): password(user1 at domain.de,212.100.55.y): Requested HMAC-MD5 scheme, but we have only MD5

I'm guessing this is normal?..

> dovecot: 2007-03-19 16:44:26 Info: pop3-login: Login: user=<user2 at domain.de>, method=PLAIN, rip=212.100.55.y, lip=x.x.x.x, TLS

So people are using TLS to log in.

> dovecot: 2007-03-19 16:47:09 Info: pop3-login: Disconnected: Inactivity: rip=84.181.7.y, lip=x.x.x.x
> dovecot: 2007-03-19 16:48:51 Info: pop3-login: Disconnected: Inactivity: rip=84.135.196.y, lip=x.x.x.x
> dovecot: 2007-03-19 16:49:51 Info: pop3-login: Disconnected: Inactivity: rip=84.135.196.y, lip=x.x.x.x
> dovecot: 2007-03-19 16:50:36 Info: pop3-login: Disconnected: Inactivity: rip=212.100.55.y, lip=x.x.x.x
> dovecot: 2007-03-19 16:50:51 Info: pop3-login: Disconnected: Inactivity: rip=84.135.196.y, lip=x.x.x.x
> dovecot: 2007-03-19 16:50:52 Info: pop3-login: Disconnected: Inactivity: rip=84.181.7.y, lip=x.x.x.x

And these don't, I suppose? Is it related to TLS? Again, when it happens
if you could log in normally with telnet, try logging in with OpenSSL's
s_client (the same wiki URL tells how).

> dovecot: 2007-03-19 18:06:58 Info: imap-login: Disconnected: rip=195.71.y.z, lip=x.x.x.x, TLS

Looks like it hangs IMAP as well?

Also stracing the correct login process (easier to test if you only use
one) or dovecot-auth process could be helpful.
http://wiki.dovecot.org/Debugging/ProcessTracing
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