To fix QuickBooks Error OLSU-1011, users should update QuickBooks, confirm banking credentials, and check their internet connection. Other solutions include adjusting bank feed settings, verifying bank support for direct connections, and repairing company files. Before troubleshooting, users should back up their data and check system compatibility. Regular updates and monitoring common issues can help prevent this error. Below are 6 methods to fix QuickBooks Desktop Error OLSU-1011.