Unshared State
When configuring a fault tolerant pair that does not share state, you must ensure that both servers use identical configurations.
This is especially important for these configuration settings:
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DestinationsBoth servers must support the same destinations.
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RoutesMessages must be able to arrive at the endpoints, using equivalent or identical routes across servers.
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Access ControlAccess control must be setup identically in both servers, so that the users.conf, groups.conf, and acl.conf file settings match.
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TLSWhen TLS is deployed, both servers must use the same certificate(s).