Overview

You are trying to start a chat with someone from the Kerio Connect web client on Safari or Chrome browser on macOS and you see the error:

Server error Cannot create conversation <username@domain.com>.

This happens due to a security feature being incompatible with Apple's devices.

This article provides the steps to resolve this error.

Prerequisites

Administrator/root access to Kerio Connect.

Solution

Follow the below steps to resolve this issue:

1. Stop the Kerio Connect service (Windows / macOS/Linux).
2. Go to the Kerio Connect installation folder. Below are the default locations:

   Windows: C:\Program Files\Kerio\MailServer\
   Linux: /opt/kerio/mailserver/
   Mac: /usr/local/kerio/mailserver/

3. Make a backup of the mailserver.cfg file, so that in case if something is incorrect after the next steps, the file can still be restored back to it's original configuration.
4. Open the mailserver.cfg file for editing.
5. Find the line <variable name="AppendHeaderContentSecurityPolicy">.
6. If it doesn't have the wss: ws: as a part of it's value, then, add it as shown below:
   <variable name="AppendHeaderContentSecurityPolicy">default-src 'self' 'unsafe-eval' 'unsafe-inline' *.kerio.com wss: ws: https: http:; img-src 'self'data:;</variable>
7. Save the file and exit the editor.
8. Start the Kerio Connect service (Windows / macOS/Linux).

Confirmation

The error will no longer appear when trying to chat with someone from the Kerio Connect web client on Safari or Chrome browser on macOS.