We have cloned our web front end server & SharePoint site stopped working but central admin is working
I have a customer who made a clone of the entire environment to a test environment. This test environment need to be literally separated from production environment since you need to clone the domain controller, the SQL Server and all servers in your production SharePoint Farm. The FQDN of your servers will be the same as in production and it’s very easy to not know where you are, since everything looks and feels the same.
In your case it could be anything from the “app pool account can’t reach the Active Directory and can’t start” to “service ‘Microsoft SharePoint Foundation Web Application’ isn’t started”. Check the most common errors in the databases, IIS and services.msc.