# Fault Tolerance

The Fault Tolerance properties page determines the behavior of EMS servers in a fault tolerant pair. The fields on this page correspond to Fault Tolerance Parameters in the `tibemsd.conf` configuration file, and influence the behavior of both the primary and secondary servers in the pair.

Fault tolerant pairs share a single JSON configuration file. To configure the secondary EMS server, add a Secondary Listens URL for each URL on which the EMS server should listen in the event that it becomes active. Click the FT Active radio button next to the Secondary Listens URL that the primary server should use to check the secondary server heartbeat.

Note: The FT Active radio button determines the `ft_active` parameter setting for the primary server. The `ft_active` setting for the secondary server is determined by the Primary Listens settings in the main Server Properties page.

For more information, see "Configuring Fault Tolerance in Central Administration" in the TIBCO Enterprise Message Service User’s Guide.

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