When QuickBooks Desktop is unable to validate the digital signature certificate, QuickBooks Error 15215 may appear on the screen. This technical error could also be caused by some unauthorized program running at the back end.
This error foils all your attempts to connect to the server. To find an effective resolution to fix Error 15215 in QuickBooks, read this article all the way through.
Procedure to fix QuickBooks Error 15215
Procedure 1: Run QuickBooks as admin
Procedure 2: Change Internet settings
Procedure 3: Swap to Selective Startup
Procedure 4: Configure Windows Firewall