QuickBooks Error 15311: Causes & Solutions QuickBooks Error 15311 keeps the program from connecting to the server when updates are being made. Outdated security settings, corrupted files, or antivirus interference are the usual causes. To fix it, you may need to update QuickBooks, check your internet settings, modify your firewall or antivirus software, or fix the installation to get it working again. Call 1.855.738.2784 if you need expert assistance with QuickBooks. URL: https://www.socialdude.net/en/articles/9699-technical-fixes-to-overcome-quickbooks-error-15311