No registration form is shown in /wp-login…

Hello,
when browsing to http://mydomain.com/subdomain/wp-login.php?action=register I’m redirected to http://mydomain.com/wp-signup.php and no registration form is shown, instead a message that says “Registration’s been deactivated”.
I have “Yes allow open registration…”
Excuse me, it’s probable this issue has already been reported and solved, but after some search I’ve not been able to find it in forums, so would you be so gentle and enligtme on how to make the registration form visible at http://mydomain.com/subdomain/wp-login.php?action=register
No custom registration fields’ been added.

Thanks in advance
(3.5.1 is the wp version used)

Thank you for reporting this important issue.

Have you checked your settings within your Network Dashboard for registration?

See: Network Admin -> Settings -> Network Settings

Make sure that you have the option set to either “User accounts may be registered” or “Both sites and user accounts can be registered.”

ok, it’s been the allow open registration in s2member multisites. I already had it activated this way (allowing open registration) but for some reason (maybe because at some point I deactivated the s2member plugin to check compatibility issues with another plugins) it didn’t work. I saved this option again and now I can access to the wp-login.php?action=register
Thx.