I'm having issues with a WordPress Multisite subsite where I can't log in - I get this error:
ERROR: cookies are blocked or not supported by your browser. You must enable cookies to use WordPress.
I have researched a lot and tried various fixes to no avail. However I saw this post that said it was resolved by removing sunrise.php which was an older way of domain mapping before it was added to core.
When I remove sunrise.php I can't access sites by entering anything other than the full URL. if I enter domain.com instead of https://www.domain.com it redirects to my main site with a message saying "registration is disabled".
I know these two things may be separate questions, but I'm feeling they are linked, in that I appear to be having issues related to domain mapping.
If anyone has experienced either of these issues, or both(!), any tips would be appreciated.