ptrouw

Could be a false positive. The successive CURL errors from Yoast SEO plugin are gone btw since your release 1.2.3.2.
Installed the plugin you suggested, forgot to activated it, but error is gone. Thx a million for all your work and patches.
Cheers Paul

• This reply was modified 3 years, 10 months ago by ptrouw. Reason: revised answer

Perhaps it is something specific in our hosting setup. Although hosting company have updated all related software to the latest Curl and tested functionality on server level and all was well.

V1.2.3.2 update, sorry still the same error!

It is the WP own site diagnostic widget.

Thank you for your quick response and update. I have just updated to v1.2.3.1 and tested again, only Chained quiz activated and default template. Unfortunately still the same error message.

Because if this error I am now also getting successive errors. Yoast SEO plugin checks for instance if your website can be found for indexing. This now triggers error message as well.