This site is inaccessible gutenberg.local does not allow connection.
Here are a few tips :
Check proxy and firewall
Does this happen for all sites in Local, or just one in particular?
Are you able to create a new, plain WordPress site in Local and access it in a Browser?
Run Local, active a website click on admin button and have the error
Which version of Local is being used?
What Operating System (OS) and OS version is being used?
Mac High Sierra 10.13.6
Attach the Local Log. See this Community Forum post for instructions on how to do so: