One more observation: I have just tried overriding siteurl and home in functions.php to https URLs without the www. prefix to the host name. Now it works, but of course the page will always be redirected to that host name without the www.. While this does not make the page function worse, it is still going to be confusing for users. But maybe this finding helps to localise the problem?
@wpcoworker thank you for your reply. I quickly tried this, but the effect is the same as before (only that, of course, I can no longer enforce an unencrypted http connection when accessing the Dashboard). Changing the siteurl and home URLs back to http now allows me to access the Dashboard without encryption again (as before).
As you have mentioned a possible http URL I have now tried to login having the Firefox development tools open looking at the network tab. I see this here:
302 POST 🔒 <my-site-url> wp-login.php
403 GET 🔒 <my-site-url> /wp-admin/
So no redirect to any http URL.
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This reply was modified 4 years, 8 months ago by hmd9261.
