This article describes the process to resolve the issue, which occurs when you are unable to access the Kerio Connect web administration GUI (Graphical User Interface) via IPv4 or hostname to modify the settings.
If IPv6 is enabled, it may be overriding the IPv4 port forwarding. This applies to situations where the localhost is inaccessible, as the operating system does not have a GUI (For example, Linux Debian or CentOS).
To resolve the issue, disable IPv6 for Kerio Connect running on Linux by following the steps mentioned below:
Navigate to the Kerio installation folder. The default location is
Open mailserver.cfg with a text editor (for example nano) using the following command:
Search for the string
Edit the value of
Exit the file by using CTRL + X and then enter Y to save changes.
The web admin GUI is now accessible via IPv4 or hostname.