Accessing my primary URL without the “www” redirects to signup.php

You have a typo somewhere.

When I go to https://academica.org.pl it redirects me to kttp://www.academica.org.pl

Are you using an .htaccess redirect?

no.
my htaccess looks like:

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]

when i change wp-config (add NOBLOGREDIRECT) and enter the https://academica.org.pl I have a blank webpage.

Is that the full and complete htaccess?

Also check your site settings in the admin side. There’s a K somewhere in there. Three broswers ALL redirect to kttp.

thats all ??
I dont know what I should do ??

Maybe I give access to my blog and someone will look on my configuration?

Can you get in on the admin side and look at the blog options (from the edit screen off sites under super admin)? Failing that, check your wp-config file as well, or even your database, but you sound Ike you might need outside help ??

Looks like he’s fixed the Http / Kttp issue, but still fully blank page when not using www in the browser address bar.

How can I get https://example.com/for-instance to redirect to https://www.example.com/for-instance, the way any Web user would expect? I’ve got define( 'NOBLOGREDIRECT', 'www.example.com' ) and it is redirecting except that in my example, my visitor would find himself at https://www.example.com instead of https://www.example.com/for-instance.

We use www consistently on our site but example.com and https://www.example.com are synonymous for a normal Web server and I can’t direct them to our homepage rather than the page they typed in. This worked fine before I turned multisite on, but I can’t find a way to get it working again. Any idea?

Hello,
I’ve added this to my theme, functions.php and it works :

function ms_block_wp_signup() {
if( strpos( $_SERVER[‘SCRIPT_NAME’], ‘wp-signup.php’ ) !== false ) {
wp_redirect( get_option(‘siteurl’) );
die;
}
}
add_action(‘wp’, ‘ms_block_wp_signup’, 99);