SAP Fiori Client on Mobile gives a certificate error

Hi ,

When i try to open the SAP Fiori  Client App on my android mobile it gives a Certificate Error as seen in the below screenshot. To use the app I connect to the VPN so that the app is connected to the appopriate server.My android version is 4.2.2.

What may be the possible solution to the issue being faced?

Thanks and Regards,

Benita