This is an internet browser security message, and you can try the following until the issue is resolved.
  1. In the browser, go to Tools > Internet Options > Advanced > scroll to the Security section > unmark the checkbox that states "Check for server certificate revocation".
  2. Add the login URL (https://altrurig01bo3.blackbaudhosting.com/) to your Trusted Sites list (found in Tools > Internet Options > Security)
  3. Check the Date\Time on the workstation to make sure it is correct