The bank feeds logs tell the story of what happens during an online connection with your bank. If the connection fails or an error is received, the logs can help pinpoint the failure. These log files are located in the same location as your company data file.
Web Connect: (these files are not encrypted and can be open as a .txt file)
Since QuickBooks' role in Bank Feeds is that of an access point, the majority of OL and OLSU errors received will need to be resolved at the bank.