Issue: You need to verify the Securly SSL certificate has been installed in Mac OS X

Solution:Navigate, in Finder, to Applications > Utilities > Keychain Access.

Double-click to open Keychain Access.

Select the “System” keychain, select Certificates under Category and look for the * SSL certificate.

To install the Securly SSL certificate

  1. Open Keychain Access>File>Import Items
  2. Navigate to the location that you saved the Securly SSL certificate file to (you can download the file below)
  3. Import the "securly_SHA-256.crt" file into the “System” keychain
  4. Verify the SSL certificates: Issued To "*" is installed

Source: Securly