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Horde Keeps Rejecting the Login

If you unable to login to your horde (groupware webmail edition, or other versions as well) installation and receive messages like:

Login failed because your username or password was entered incorrectly.

or in /tmp/horde.log file you have something similar to:

Oct 29 12:18:42 HORDE [error] [imp] FAILED LOGIN for iqa [100.xx.xx.xx] to {localhost:143 [imap/notls]} [pid xxxxx on line 139 of “/var/www/horde/imp/lib/Auth/imp.php”]

then before digging deeper into horde internals, it is worthwhile to check whether your imap daemon (dovecot-imapd in my case) is running because if you have configured in many installations imap is the default authentication mechanism that horde uses. It can be checked quite easily by issuing:
telnet localhost 143
And if the response is like the following:
telnet: Unable to connect to remote host: Connection refused

then you do not have an imap daemon running. And that is preventing the horde to authenticate. In this case, you could install dovecot-imapd which will serve as the imap daemon and would provide the desired authentication mechanism for horde.



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