Adding an existing cluster after setting up CC a standalone docker: error "Couldn't determine the datadir on"

Hi,
I've installed CC as a docker container (linked to a mysql db containers) according to example: https://github.com/severalnines/docker/tree/master/examples/docker

The only difference is I didn't use the 192.168.10.0/24 range for my  "db-cluster" docker network as it conflicts with my existing ranges.

So I picked 10.0.0.0/24 with the master living on 10.0.0.10 and db containers as 10.0.0.100 - 10.0.0.103

Installation went fine and I can bring up the CC page and set my user.

Next step: I'm trying to add an existing Galera (Percona Xtradb 5.6) cluster.

The ssh part works fine. The setup, however  fails with the following errors (reverse-chronologically):

• [11:22:35]: Adding existing cluster has failed.
• [11:22:35]: Couldn't determine the datadir on '192.168.10.62:3306' connect (from 10.0.0.10), failed for user 'cmon': Access denied for user 'cmon'@'192.168.24.28' (using password: YES) (errno: 1045) (errno: 1045)
• [11:22:31]: Granting controller 'cmon'@'192.168.24.28' on '192.168.10.62' (host was not allowed to connect).
• [11:22:26]: Granting controller 'cmon'@'192.168.24.28' on '192.168.10.62' (host was not allowed to connect).

The grants seem to be fine on my DB host: I'm able, for example to execute from inside my clustercontrol container:

root@utils01:~# docker exec -it clustercontrol /bin/bash

[root@clustercontrol /]# mysql -ucmon -h192.168.10.62  -p***** -e "show global variables like 'datadir'"
Warning: Using a password on the command line interface can be insecure.
+---------------+-----------------+
| Variable_name | Value           |
+---------------+-----------------+
| datadir | /var/lib/mysql/       |
+---------------+-----------------+

Any suggestions anyone?