Overview

You upgraded the Kerio Connect appliance/s to version 9.3 and are now running into one or more of the following issues:

Kerio Connect server's CPU is constantly utilizing 100%.
Kerio Connect keeps on disconnecting/crashing and restarting frequently. Error logs related to libdkimpp and libcrypto-kt.1.1 are seen.
SSL Certificate becomes untrusted/invalid/rejected after upgrading to 9.3.0 (CentOS, RHEL).
Kerio Connect server doesn't connect to MyKerio.
Kerio Connect Webmail crashing with the Kerio Connect Client Error dialog, which then shows NestingLevel error.
All-day Calendar event displayed on the previous day in some timezones.
On iOS via ActiveSync, error is returned ParseCalendarContent: Unknown method: 6
Event attachments in Russian filename lose filename after uploaded.
Printing Attached Emails shows the Date of the Host Email Instead of the Attached Email.
Anti-Virus Updates fail on CentOS, RHEL.
Webmail Inbox Notifications for shared mailboxes where the user is not the Owner.

This article provides a resolution for these errors.

Solution

Upgrade the Kerio Connect appliance to the 9.3.0 Patch 2 version or later

After a successful upgrade, none of the errors mentioned previously would be seen and Kerio Connect will work as expected.