Hello, everyone. Jessie here, a customer service representative. Many QuickBooks customers have contacted me inquiring about a simple fix for 'QuickBooks Error 103.' Then, under the error notice, click the Reconnect button. Make careful to input the username and password by hand. Then press the Sign-in Info Update button. Check your bank's connectivity. To access the Security Center, go to the Self Service Tab and then Security Center. Otherwise, go to Business Tools and pick Manage Security from the drop-down menu. Finally, keep an eye out for Third-Party Access.