Some organizations require a client certificate to be installed on the device for secure connection with the server. If that is your case, please follow the steps below to get the certificate on the device.
This will copy the client certificate to TouchDown. Once the process is completed, you should delete the Client.cer (or client.pfx) file from the SD card.
If the certificate was exported with a password, TouchDown will prompt you for the password before importing the certificate file.