Hello everyone, I had the same problem on my multisite wordpress. When trying to access the subdomain, returned an error establishing database connection. When acceded to the network admin I can’t manage the site, no links to it. In the Sites Menu, the corresponding entry of the site, shows empty entry, with an icon of external domain.
In my case, tables were at the database but wp_5_options .. “notice 5 is the blog id” was marked by the database manager as corrupted. I selected it, repaired and it worked again.
Hope this helps.
