The page isn't redirecting properly

I get this error when i try to access the new site dashboard:

The page isn’t redirecting properly
Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
This problem can sometimes be caused by disabling or refusing to accept cookies.

The main site works ok, i created the network using a subdomain and/or subfolder, same error in both ways

https://www.ads-software.com/extend/plugins/multilingual-press/