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Hello @bibeldans,
The website cirkel.danskyrka.eu is not hosted with SiteGround and it is not possible for us to review the problem.
Is it possible to provide us a screenshot of how you see the Test URL Caching field? Could you please include the configuration in your Dashboard > Settings > General and show the URL for WordPress Address (URL) and Site Address (URL)?
I would also advise you to deactivate the plugin and then delete and re-install it in order to verify if the issue is still present.
Best regards,
Georgi Ganchev
SiteGround Technical Support
OK, but where is the Test URL Caching field?
Both URLs are of course https:/cirkel.danskyrka.eu
PS. 404 Error is from 66.249.93.155, i.e. Google!
@bibeldans,
The Test URL Caching field is present once you navigate to SG Optimizer > Caching, then scroll until you see the field.
By default, the test URL is obtained from the values of WordPress Address (URL) and Site Address (URL) under your wp_options table. In case you see the wrong URL there, this would mean that your URL configuration might be set wrong. This would explain the 404 error that you reference.
Since the information provided on your end is insufficient, please be more specific and provide screenshots of the errors that you noticed and the steps that we should take to replicate them.
Best regards,
Georgi Ganchev
SiteGround Technical Support