Banking error 102 or 105 simply means QuickBooks Online is unable to connect to your bank’s website at this moment.
To resolve Error 102 or 105:
The error often resolves itself within 24 hours.
To see if you can connect, select Update on the Banking page. If you still can’t connect, please wait 2 or 3 hours then try again.
If you are looking for specific information about Wells Fargo Error 102 and 105, please check out this other community article, Wells Fargo Error 102 and Error 105
If you’re still seeing this error for other FI's after 72 hours, please contact QuickBooks Online Support.