503 Service Unavailable

I’m sorry I’m not good at English.

Thank you for developing a great tool “Local by Flywheel”.
One problem is happening.

The installation went well.
However, When I click the START SITE button, and then click the ADMIN button or the VIEW SITE button,

On Chrome screen

503 Service Unavailable


503 Service Unavailable

Will be displayed.

I tried several.
There are PCs that have run without problems and PCs that are in the above state.
The wrong PC is DHCP. Also, filtering software is included.
A successful PC is a fixed IP, not covered by filtering software.

I looked at the hosts file. xxx.local #Local Site www.xxx.local #Local Site

from chrome

I tried to access in, but the result is the same.

Is there no way to move it?