Download the Network Solutions Intermediate Certificate

On your MAC OS, Go to

Applications/Utilities/Keychain Access. You will see the following screen:
                                              

Then while Keychain Access is the selected app, go to File/Import Items. (below)

Here, on the bottom of the sceen, make sure that Microsoft Intermeditary Certificate is selected. Then upload the Network_Solutions_Intermediate.crt file, once you click ok, go back to the main screen and click on Microsoft inter. cert on the left (look at the first image) the NS cert should be there.

Once this is complated, you may proceed to login to

https://citrix.myhostedcloud.com