You’ll get this error if you entered your login credentials incorrectly. Check that you entered your login credentials for the bank correctly and update for existing connections or re-enter your information for new connections.QuickBooksError 103 means is your accounting software has been stopped to taking your sign in request. This error will happen when the consumer login his credentials has been registered in Quickbooks Online, but this is not accepted by any financial status website. And also you have to do first update their sign in details on their bank website.In case QuickBooks Error Code 103 keeps appearing you can repeat the steps mentioned above, while using a different bank account or card. Users also need to make sure they go to the official bank website and make the necessary changes to authorize connections to third-party applications. If the error persists and you still cannot log in to your bank using QuickBooks Online then you can call the QuickBooks support number and ask for additional assistance. Professional software experts are available 24 hours a day and will be able to give a step-by-step guide so that you can solve QuickBooks banking error 103 as soon as possible.