Immediate failover occurs when PingDataSync receives one of the following error codes from an external server:
- BUSY (51)
- UNAVAILABLE (52)
- SERVER CONNECTION CLOSED (81)
- CONNECT ERROR (91)
If PingDataSync attempts a write operation to a target server that returns one of these error codes, PingDataSync will automatically fail over to the server instance with the next-highest priority 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.