Can not configurate containerized Networker client on server side web ui

Hi All

Now I face a problem is that I configurate the containerized networker client from out side the k8s cluster on server side web ui. The server is not in the cluster. But it always failed at step2 on configuration client wizard.  You can check the images below.

I have confirmed that the network, the configuration parameters are all OK. Also if I put the client outside the container this step will be

successful.　After my investigation , I suspect that the networker client does't support the docker‘s file system： overlay. which only support ext3/4 ,reiserfs, jfs, xfs. Am I right? If so ,how could I make aroud this?  Thanks all.

Networker : 9.1

container os: centos 7.5