QuickBooks Error 15311 occurs when QuickBooks is trying to verify the digital signature to keep your computer protected. If the QB application fails to verify the digital signature, you will get the error. The possible causes could include an outdated QuickBooks causing the issue. This is how you can quickly get rid of this frustrating error in QuickBooks :
Update your QuickBooks application
Login to the QB application and click the help tab
Click the Update QuickBooks option followed by Update now and get updates.
Now that you have clicked it, close the QB application and reopen it.
Updating the QuickBooks, all components are installed and registered properly. Alternatively, Update the Microsoft security certificate. If QuickBooks Error 15311 still persists, try connecting with experts at toll-free number +1(855)-955-1942.