[John James Jacoby]

All of the manual -config.php file changes are “recommended settings” and should not be considered “required settings.”

It will still take some trial and error to sync the platforms up, and some educated cookie viewing to make sure each platform is dropping the same cookies with the same hosts, paths, domains, and hashes.

My advice is to make sure that the cookie, key, salt, path, and domain related manual entries into your -config.php files are mirror images of each other, and then start modifying from there if one platform drops a cookie differently than the other.