You know you’re using the right password, so why can’t you log into Webmail? One common issue users see on courier-IMAP systems when trying to log into Horde is:
Notice: (null)(): Retrying LOGIN authentication after AUTHENTICATE LOGIN failed (errflg=1) in Unknown on line 0 Notice: (null)(): Retrying LOGIN authentication after AUTHENTICATE LOGIN failed (errflg=1) in Unknown on line 0 Notice: (null)(): Can not authenticate to IMAP server: AUTHENTICATE LOGIN failed (errflg=2) in Unknown on line 0
To rule out a service failure, restart both cPanel and courier-imap:
/etc/init.d/courier-imap restart
service cpanel restart
The fix that works 98% of the time is to run these commands:
mv /etc/vmail /etc/vmail.bak
/scripts/updateuserdomains
If that doesn’t correct the error, in some cases running a courier update has corrected the issue:
/scripts/courierup –force