"Cookies are blocked or not supported" since update to 3.7.1

Having the same issue… Too bad the other topic got closed.

@alekseyn: If you require assistance then, as per the Forum Welcome, please post your own topic. Then we won’t have to go around closing topics because people have turned them into an unsupportable mess.

After doing all of the below I still have the same problem.
– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the default theme to rule out any theme-specific problems.

– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading all files & folders – except the wp-content folder and wp-config.php & root .htaccess files – from a fresh download of WordPress. Make sure that you delete the old copies of files & folder before uploading the new ones.

Please help.

After disabling all themes except either Twenty10, 11 or 12 I only see a white screen. I am currently using theme “Appointment”.

Disabling all plugins makes no difference. Still the same error.
Disabling all plugins and all themes except Twentie10, 11 or 12 gives me a white screen.

Have you spoken to your hosts about this? Or checked your site’s error logs?

Yes. They confirm nothing changed on their side. What puzzled the engineer, and I know him very well and trust him, was the switching from https://www.domain.nl to https://domain.nl when you open a site. I can see WordPress creates cookies both with and without the www prefix in one session.

What urls are entered in Settings -> General?

I cannot login, therefore I cannot check …. Is there another way?

No. WordPress cannot make any changes to site urls.

That is not what I meant. Is there another way to check the url setting, as I cannot use the admin screen to access Settings => general.

Is there another way to check the url setting, as I cannot use the admin screen to access Settings => general.

As I said above, no. Well, not unless you start looking through the wp_options table of your database. But I would strongly advise against making any changes yourself in the database as the urls may be stored in serialized form in some places. Failure to change all occurrence – including the serialized ones – could stop the site in its tracks.

OK, I see. So, what’s next?

Have you tried using another browser? Another computer?

Any browser, any computer, Android phone, any network. And I have two separate sites that have the same issues. They were both running fine before 3.7.1.