Network Admin links broken

I think I may have broken something in my hacking around.

I have a multisite setup, no sub-domains. I can log into admin and see all my sites. I log directly into the main site.

If I try to go to Network Admin via the drop-down menu items “My Sites”, then I see links “http//mydomain.com/wp-admin/network”

As you can see the “:” is missing after “http”

If I try going there by entering the full path into my browser “https://mydomain.com/wp-admin/network” then I end up with an “ERR_NAME_NOT_RESOLVED” – The server at http can’t be found, because the DNS lookup failed

So I suspect my .htaccess, but its stock standard.

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

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule ^[_0-9a-zA-Z-]+/(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^[_0-9a-zA-Z-]+/(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

(I have tried $1 and $2 variants)

wp_config is also as per standard advice.

I have also looked through my database and all the siteurl’s look ok in the various fields for the main wp_options and the wp_#_options as well as wp_site, so I’m stumped.

Any suggestions?