CC3220SF-LAUNCHXL: HttpClient_Connect: ERROR Socket Connect, status=-456 (error secure level bad CA file), while connecting with dropbox

Part Number:CC3220SF-LAUNCHXL

Hi,

I am trying to use cloud_ota application that is present in SDK, but here I am getting below error while connecting with dropbox server (api.dropboxapi.com)

HttpClient_Connect: ERROR Socket Connect, status=-456 (error secure level bad CA file).

In the application using below CA file

OTA_SERVER_ROOT_CA_CERT         "GoDaddy_class2_CA.der"

I tried to download above file but i did not get, can anyone help me to get above file??

Thanks,

Hariom