The certificate has been installed, but smartphones and tablets return an error when connecting
This error can have various sources. In our manual for this error message, various solutions are available.
When the server does request a client certificate, this error message may be shown. By removing the requirement on the server to request client certificates, this error should disappear.
Couldn't fix the problem yourself? We're happy to help via firstname.lastname@example.org. Please describe your problem as detailed as possible, with all relevant information like: software versions, the SSLDiag output, screenshots and logs. We'll get back to you as soon as possible.