QuickBooks Error 15311 is associated with issues related to the installation of digital signatures. Here are steps to resolve the error:

Method 1: Reinstall QuickBooks using Clean Install

• Create a Backup:

  • Before proceeding, make sure you have a backup of your QuickBooks data.

• Uninstall QuickBooks:

  • Go to "Control Panel" on your computer.

  • Select "Programs and Features."

  • Locate QuickBooks in the list and uninstall it.

• Download the QuickBooks Clean Install Tool:

  • Download the Clean Install Tool from the official QuickBooks website.

• Run the Clean Install Tool:

  • Execute the downloaded tool and follow the on-screen instructions.

  • Choose the version of QuickBooks you want to install and click "Continue."

• Rename the QuickBooks Installation Folders:

  • The Clean Install Tool will prompt you to rename folders. Follow the instructions carefully.

• Reinstall QuickBooks:

  • After using the Clean Install Tool, reinstall QuickBooks using the original installation media or download it from the official website.

• Update QuickBooks:

  • Make sure to install the latest updates for QuickBooks after the reinstallation.

Method 2: Adjust Internet Explorer Settings

• Update Internet Explorer:

  • Ensure that you are using the latest version of Internet Explorer.

• Set Internet Explorer as the Default Browser:

  • Open Internet Explorer.

  • Go to "Tools" and select "Internet Options."

  • In the Programs tab, check the box that says "Make default."

• Adjust Security Settings:

  • In Internet Explorer, go to "QuickBooks error 15311" and select "Internet Options."

  • Navigate to the Security tab.

  • Set the security level to Medium-High.

• Add Intuit as a Trusted Site:

  • Go to the Security tab in Internet Options.

  • Select the Trusted Sites zone.

  • Add the following sites: *.quickbooks.com and *.intuit.com.

  • Click "Close" and then "OK."

• Clear SSL State:

  • In Internet Explorer, go to "Tools" and select "Internet Options."

  • Under the Content tab, click "Clear SSL State" and then click "OK."

After performing these steps, restart your computer and open QuickBooks to check if the Error 15311 is resolved. If the issue persists, you may want to consult the QuickBooks support team or seek assistance from a qualified IT professional.