Immediate failover occurs when PingDataSync Server receives one of the following error codes from an external server:
- BUSY (51)
- UNAVAILABLE (52)
- SERVER CONNECTION CLOSED (81)
- CONNECT ERROR (91)
If PingDataSync Server attempts a write operation to a target server that returns one of these error codes, PingDataSync Server will automatically fail over to the next highest prioritized server instance in the target topology, issue an alert, and then reissue the retry attempt. If the operation is unsuccessful for any reason, the server logs an error.