You will probably want to upgrade that to 2.1.12.
Regardless, the issue seems to be that the connection between your certificate and the root authority could not be made, possibly due to a missing intermediary certificate between the root CA and your certificate, or possibly due to a missing root CA in the client software. Try using
https://www.digicert.com/help/ to see if your certificates are installed right, and if the problem continues, make sure you update your Access Server to the latest version and also install the latest version of Connect Client by downloading it from your upgraded Access Server.