A few issues in MAAS

I have some few issues that find out docs are not useful at all.
I have installed MAAS via snap and it is fine but so far I have got a few problems that could not solve them.

First, I have created local mirror which does not work with the following url.

it says refuse to connect.

Second, cento7 image is stuck in the following state.
Waiting for rack controller(s) to sync

@sysnasri, hey, did you ever resolve this?