# Configuration Errors

When an EMS server is started, the fault tolerance mechanism is triggered by the presence of a URL in the Secondary Listens list of a primary tibemsd, or by that of a URL in the Primary Listens list of a secondary `tibemsd`.

Once fault tolerance is triggered, the EMS server generates an error if it finds that the "FT Active" switch was not assigned to any URL in its peer’s list. If `CONFIG_ERRORS` is present in the `startup_abort_list` parameter, the `tibemsd` aborts startup. Otherwise, the `tibemsd` cancels fault tolerance and starts without checking its peer. This results in a file lock error for the EMS server that is started second.

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