Horde error: Login failed because your username or password was entered incorrectly

Created:

2016-11-16 13:09:15 UTC

Modified:

2017-08-16 16:11:25 UTC

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Horde error: Login failed because your username or password was entered incorrectly

Applicable to:

  • Plesk for Linux
  • Plesk 12.0 for Windows

Symptoms

Horde is configured to use IMAP protocol on my Plesk server. The following error appears when trying to log in to webmail:

Login failed because your username or password was entered incorrectly.

The /var/log/psa-horde/psa-horde.log log can contain the following error:

HORDE [error] [imp] FAILED LOGIN

Cause

Plain text authentication is, most likely, disabled in the Courier IMAP configuration file.

Diagnostics

On the Plesk server, try connecting to localhost via IMAP using telnet:

# telnet localhost 143
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2004 Double Precision, Inc. See COPYING for distribution information.
01 login mailname@example.com <password>
01 NO PLAIN text authentication does not support

If the connection is successful, please refer to the following article:

213396949 Horde Webmail login fails: How to troubleshoot

If not, and you see the " 01 NO PLAIN text authentication does not support " message, proceed to the resolution below.

If you are not able to connect through Telnet and seeing message as "Connection refused", then ensure that "courier-imap" service is running. If it is not running, start it with command:

  # /etc/init.d/courier-imap start

Resolution

Enable plain text authentication by editing /etc/courier-imap/imapd :

Add the AUTH=PLAIN parameter to the values of the IMAP_CAPABILITY variable.

For example:

IMAP_CAPABILITY="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT AUTH=PLAIN THREAD=REFERENCES SORT QUOTA IDLE"

Do not forget to restart courier-imap service:

# /etc/init.d/courier-imap restart
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