If TaxCalc loses contact with, or has never been able to connect to a database, you will receive the following error message (The wording in the top panel may differ slightly).
This means that your additional machine cannot ‘see’ the server machine – the one on which the database is installed. You can fix this by creating a connection file, as follows.
Step 1: On the server machine
Step 2: On the additional machine
Click on the drag and drop message at the bottom of the error window, and you will see the drag and drop window. Find the database connection file you created in Step 1 and drag and drop it onto the error message box (pictured below).
You should now be able to log in as usual.
Please Note; This information is only applicable to Additional machines not the one acting as the TaxCalc server. If you have issues on the Server computer itself. It is likely that the PostgreSQL service is not started. See Postgres does not always start when the "server" machine is rebooted for more information.
If you still can't log in, you may be presented with the same messaging as per the first screenshot in this article.
This most likely means that there's an issue with the firewall settings on one or both machines.
To fix this, you need to open the following ports through your firewall:
Before opening the firewall ports, you can try temporarily disabling the firewall completely. However, this test is entirely at your discretion as disabling a firewall always carries a risk.
If the database connection can be made while the firewall is disabled, the problem is definitely with the firewall.
Re-enable the firewall and open the ports listed above correctly, using the guidance for your specific firewall. This should solve the connection problem.
If you need more help with firewalls, read the following: