I generated a certificate via https://gethttpsforfree.com/ because I only use a webhosting service and have no access to the server itself.
It works fine on all my computers, but my mobile devices show the untrusted error. I tested Android 5 and 6 Chrome and iOS 9 safari.
The let’s encrypt helloworld works fine.
I analysed the certificate via https://www.ssllabs.com/ssltest/analyze.html and is tells me “This server’s certificate chain is incomplete”. Might this be the problem? How can I fix this?
Any ideas what went wrong?
Thank you very much for helping a ssl newbe.