Can′t access the Network dashboard after updating to 3.3

I have updated an old Multisite to the current version since I had lots of problems. I did it using the automatical feature on the dashboard.

What version WERE you on?

Thanks Ipstenu for the answer

I think I was in the 2.2

I have decided to start from scratch.

I created a new Data Base and renamed the old root directory public_html

I installed the multisite as subdirectories (blog1.mydomain.com, blog2.mydomain.com)

Now I have these problems:
At front end
– All sites are accesible from the browser if you type the WWW
– Typing WWW will redirect you to a signup page
At the back end
– I can navigate trough the dashboard
– I can not reach pages or post since they are in this way: https://mydomain.com/wp-admin/post.php?post=2591&action=edit. It redirect me to a signup page.
– If I add manually the WWW to the post address of the post I could reach it (it exist in the data base), but if I update, I get redirect to the signup page.

Adding the following line:
define( 'NOBLOGREDIRECT', 'https://www.severus.es/' );
to the wp-config.php will cause that any mistake by typing the url will redirect to the signup page, no to a 404 page.

My .htaccess is as follow:

RewriteEngine On
#RewriteBase /
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule . index.php [L]

My wp-config.php

define('WP_ALLOW_MULTISITE', true);

define( 'MULTISITE', true );
define( 'SUBDOMAIN_INSTALL', true );
$base = '/';
define( 'DOMAIN_CURRENT_SITE', 'www.severus.es' );
define( 'PATH_CURRENT_SITE', '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );

Before updating, the network was working fine supporting 31 blogs, redirecting perfect

Any advice?

Per https://codex.www.ads-software.com/Create_A_Network

If you have www in the settings for your domain url, and plan to use subdomains for multisite, make sure that both the site address and the WordPress address are the same. If you plan on changing them to domain.com or https://www.domain.com, do so before you begin the rest of the setup for MultiSite, as changing the domain name after the fact is more complicated.

Also, we sort of recommend using NON www. it seems to work better.