This documentation is for Dovecot v2.x, see wiki1 for v1.x documentation.
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First of all enable {{{auth_debug_passwords=yes}}} and see if the logs show what the problem is. For non-PAM setups it should contain all the information needed to solve the problem. If it's trying to use a wrong password scheme, you can change that. See ["Authentication/PasswordSchemes"].
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 * Usually the problem is that you don't have a correctly named file in {{{/etc/pam.d/}}}. See ["PasswordDatabase/PAM"]
For non-PAM set {{{auth_debug_passwords=yes}}} and look at what it says in the logs
. If it's trying to use a wrong password scheme, you can change that. See ["Authentication/PasswordSchemes"]
 * Usually the problem is that you don't have a correctly named file in {{{/etc/pam.d/}}}. See ["PasswordDatabase/PAM"].

Why doesn't Dovecot work?

  • Dovecot always logs an error message if anything goes wrong, so make sure you're looking at the correct log files. Debug messages may be written to a different log file than error messages. See ["Logging"].

  • Try logging in manually by sending IMAP commands. If you're trying with an IMAP client you can't be sure if the problem is with the client's configuration or Dovecot's configuration. See TestInstallation (or TestPop3Installation).

  • Are you using an older version than v1.0? RHEL 5.0 and Debian Etch distribute v1.0.rc15, and there have been a LOT of fixes since then. If you have a problem, see if [http://dovecot.org/doc/NEWS NEWS] file mentions anything related to it. There are also [:PrebuiltBinaries:binary packages] available for newer versions.

It says "Authentication failed"

First of all enable auth_debug_passwords=yes and see if the logs show what the problem is. For non-PAM setups it should contain all the information needed to solve the problem. If it's trying to use a wrong password scheme, you can change that. See ["Authentication/PasswordSchemes"].

If you're using PAM:

  • Make sure that dovecot-auth is running as root (assuming it's using /etc/shadow).

  • PAM errors aren't written to Dovecot's own logs. Usually they go to /var/log/auth.log or something similar.

    • Unfortunately PAM's error messages aren't always all that helpful in figuring out what exactly the problem is.
  • Usually the problem is that you don't have a correctly named file in /etc/pam.d/. See ["PasswordDatabase/PAM"].

It says Can't load certificate

If the key isn't password protected and you get an error like:

Sep 29 01:33:54 mail dovecot: imap-login: Can't load certificate file /etc/ssl/private/ssl-cert-mail-cacert.pem: error:0906D06C:PEM routines:PEM_read_bio:no start line
Sep 29 01:33:54 mail dovecot: child 27252 (login) returned error 89
Sep 29 01:33:54 mail dovecot: imap-login: Can't load certificate file /etc/ssl/private/ssl-cert-mail-cacert.pem: error:0906D06C:PEM routines:PEM_read_bio:no start line
Sep 29 01:33:54 mail dovecot: child 27253 (login) returned error 89

You may have mixed up the ssl_cert_file and ssl_key_file settings in the config file. (v1.1.4+ mentions this in the error message.)

User's IMAP connection gets unexpectedly closed while retrieving headers of a large folder

And the log looks like:

Sep 12 16:10:34 hostname dovecot: IMAP(username): block_alloc(): Out of memory
Sep 12 16:10:34 hostname dovecot: child 17717 (imap) returned error 83 (Out of memory)

You may need to increase the mail_process_size setting in the config file. (v1.1.4+ mentions this setting in the latter error message.)

None: WhyDoesItNotWork (last edited 2018-09-09 05:36:49 by AkiTuomi)