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QuickBooks error 103 normally occurs when the login or sign-in details you entered do not correspond with the details registered on your financial institutions website. You can follow the steps given below to fix error 103 on QuickBooks:

·        Step 1: Press the Reconnect option on the error message

·        Step 2: Manually enter your QuickBooks username and password

·        Step 3: Select Update Sign-in Info and make the necessary changes

·        Step 4: Search for the bank's login webpage URL to verify the connection

If you are still unable to sign-in and you still receive the QuickBooks error 103 messages then you can call the QuickBooks technical support phone number and ask for technical assistance.