I am receiving an "Unknown error" while trying to upgrade through the program or connecting to Data Warehouse

While trying to connect, I receive the following message:

"There was an error connecting to the server. The error was 'unknown error'"

1. Check you are connected to the internet. If you are not, connect to the internet, close and reopen Cashbook and then retry. 

2. Check you are on the latest version. To do this go to Help > About, the version number is at the top of the window. You can check it is the latest by checking the Practical Systems website.

3. If none of the above work please contact Practical Systems