The connector logs can assist when diagnosing issues for QuickBooks Desktop. There are two sets that are useful in our investigations.
QuickBooks Connector Logs
The logs files created by the connector itself are located in:
C:\Program Files (x86)\<CLIENT NAME>\QuickBooks-connector\logs\connector.log
It can also be useful to get the link.json file which is located in:
C:\Program Files (x86)\<CLIENT NAME>\QuickBooks-connector\link.json
You can also check the log files location by logging into the Codat Portal, then navigating to Monitor (1) > Health > Offline connectors (2) then selecting searching for and selecting the company. On the System Tab (3) and you will be able to see the connector location in the Computer information (3) section.
QuickBooks Logs
There are also logs created by QuickBooks itself which are located in:
C:\ProgramData\Intuit\QuickBooks\qbsdklog.txt