Usually, this error means that the financial institution is temporarily having trouble with its Internet banking system, or that your Internet Service Provider (ISP) is overloaded with traffic.
To resolve this issue:
Wait 15 minutes and then try connecting again. QuickBooks should be able to connect again normally after the financial institution or your ISP fixes the problem.
Try connecting at off-peak hours and, for dial-up connections, with a different access phone number.
Contact your financial institution and ask if their online banking system is working properly.
Check your Internet connection to see if it is working properly.
If your Internet connection is working and your financial institution's Internet banking system is also working but QuickBooks still will not connect to it, contact QuickBooks Technical Support.
Troubleshooting online banking errors