Why doesn't DTS work in Safari 10?

Apple recently published an update that included a new version of Safari this version includes a new way to allow Java to run in UnSafe Mode.  To turn off safe mode you will need to press and hold the Option key on your keyboard, click the drop down menu, and uncheck "Run in Safe Mode".  Once that has been unchecked, click done and close Safari Preferences.  At this point you can try the login process again, and you shouldn't see error code 305.