Hi Thomas,
did you saved your certificate in here?
“Gobal Settings - Site Management - Trusted certificate authorities for SSL”
Someone had a similar problem right here, but it’s in german, so i don’t know if you understand that.
In generell, the most errors here appear, because the certificates aren’t saved in the right places.
The fact that it still works, confuses me. Do you have a second LDAP-Connection online?
And the error only appears while testing the LDAPs-Connection by hand?
Did you checked in the werks, if there is a bug known in your version for that? Similiar thing happened once for the host diagnostic.