I installed the Workflow Manager on the same SharePoint 2016 farm.
I can create a workflow that sometimes working, but sometimes gets canceled automatically!
Where can I check the work flow log?
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There are 2 places where you can find some more error information.
A. Retreive it from Database (not supported on production)
In the SharePoint page workstat.aspx, copy the field requestor id
In the URL query parameter from the worsktat.aspx page, copy the instanceid field
Open the WFInstanceManagementDB database with SQLManagement Studio, then request from the DebugTrace table
The exception is in the WorkflowStatusDetail column
B. Server Logs
more info on troubleshooting: https://blogs.msdn.microsoft.com/vincent_runge/2014/01/07/troubleshooting-actions-for-sharepoint-2013-workflows/