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In the transaction /IQX/OL_ENDPOINT there is a 'Connection Test' option to check for the correctness of the URL and API key. This can be executed in each system:
or, for example, 
In FAB 3.3 release, the framework was improved should be resilient to terminate the long-running job after a period of time, i.e. 10hrs ~ 36000 seconds. This will make stuck background jobs to be restarted so next scheduler can continue on another round of background jobs. Configuring time-out period per OPS type would look like this:
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OneList Integration configuration
Note that you will (only once) have to configure a User integration entry. You may end up with multiple processes integrating with OneList, each of which will require their own entry here (and follow-on entries - see below). It does not matter how many processes you integrate with OneList, you will only need to do this step once - the processes all share the user integration. Add an entry to synchronise the SAP users with OneList, as follows (and note that the Task ID and the Fab Layout form entries remain empty):
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