I am having this exact same issue. The only error message that is shown is at the beginning of the connection process where it says this way of connecting has expired (350) and I have to log in again. I am using firefox on my computer. Please let us know how to solve this, thanks. I tried disconnecting Paypal on the paypal end. When I attempted to reconnect it seems to still have me logged into paypal on the QB side so I logged out in the quickbooks pop up and logged in again to go through verification. Still doesn't work.