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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Hello,</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"> I have a Kolab installation on Ubuntu 16.04 LTS that is working fine. Today suddenly for no clear reason stopped being able to login to Roundcube. The same happened to webadmin. The message on /var/log/roundcube/errors was</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace'; color:#000000; background-color:#ffffff;">04-Feb-2019 15:56:02,817086 +0200]: <bcsu5pfp> IMAP Error: Login failed for user@example.com from XX.XX.XX.XX. AUTHENTICATE PLAIN: in /usr/share/roundcubemail/program/lib/</span><span style=" font-family:'monospace';">Roundcube/rcube_imap.php on line 196 (POST /roundcubemail/XTjBqn6JcMCZoim7/?_task=mail&_action=refresh)<br /></span></p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">This is the second time that this incident has happened, the first one being about a year ago</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Both times the problem was resolved after 5-6 reboots of the server but this solutions seems not so convinient.</p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Does anyone had the same problem or can help me to find the causes of it.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Thank in advance</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Dimitris Paraschou</p>
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