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High Availability errors

Always On availability groups and database mirroring: replicas, listeners and endpoints.

976 The target database is participating in an availability group and is not accessible for queriesA secondary replica does not allow reads, or data movement to it is suspended. 35250 The connection to the primary replica is not activeA secondary cannot reach the primary through the AG endpoint, so the join fails. 1418 The server network address cannot be reached or does not existThe mirroring endpoint address cannot be reached: port, firewall, endpoint state or permission. 1408 The remote copy of the database is not recovered far enough to joinLog backups taken on the primary after the full backup were not restored on the secondary before the join. 35206 A connection timeout has occurred on a previously established connection to an availability replicaError log entry: a replica missed pings for longer than the session timeout (network, load or RESOLVING). 983 Unable to access availability database because the replica is not PRIMARY or SECONDARYThe replica is RESOLVING during a failover or quorum loss, so its AG databases are offline. 19456 None of the IP addresses configured for the listener can be hosted by the serverNo listener IP address fits a public cluster network on the named server, so it cannot host the listener. 41131 Failed to bring availability group online; the operation timed outThe AG cluster resource did not come online in time, usually because the NT AUTHORITY\SYSTEM login or its permissions are missing.
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