Error 6025 indicates the client and server do not agree on the encryption key during the connection process and causes an inability to connect.
Make sure you are on the latest version of the app. The app will automatically check for updates every 24 hours, but if you wish to manually check you can do so by clicking on "Customize" in the bottom left and then click "About". Click the "Beta Updates" button. If you are up to date, you will see a notification at the top of the screen.
If you need any further assistance, please contact our 24/7 Customer Success Team, who would be glad to assist.