Hello,
Thank you for your reply. Yes, I did a proper search before posting here and I have found and read that website you mention. Like I wrote in the edited post, I did manage to get the certificate out of alfresco and into my phone. This seems to work, because now the error about the certificate is no longer appearing. But now I get the error that the server is 'not reachable', which doesn't make sense because the mobile app can connect with the same servername and credentials if I don't choose https and the port is set to 8080. From a webbrowser (on the same phone) I _can_ access my alfresco server with https and port 8443………