By default, Unimus will prefer IPv4 for dual-stack hosts.

You can configure Unimus to prefer IPv6.

On Windows:

For portable:
Create a file named Unimus.l4j.ini in the same directory as the Unimus executable.
Change Unimus in the above file name to exactly match the name of the Unimus executable.

For installer:
Add the below lines to Unimus.l4j.ini in 'C:\Program Files\Unimus\'.

Inside of this configuration file, please add the following lines:

-Djava.net.preferIPv6Addresses=true

Please make sure to place each argument into its own line.

Restart Unimus to apply the new configuration.

On Linux (Debian/Ubuntu):

Edit the contents of /etc/default/unimus.

Add this into the file:

-Djava.net.preferIPv6Addresses=true

Restart Unimus to apply the new configuration.